diff --git a/.github/PULL_REQUEST_TEMPLATE/projectasap.md b/.github/PULL_REQUEST_TEMPLATE/projectasap.md
index 1a4950438..7b0c4cf5a 100644
--- a/.github/PULL_REQUEST_TEMPLATE/projectasap.md
+++ b/.github/PULL_REQUEST_TEMPLATE/projectasap.md
@@ -57,6 +57,12 @@ Mark non-applicable forms explicitly; do not fabricate evidence.
 
 Give each new test a one- or two-line behavioral purpose.
 
+## Snapshot changes
+
+For each changed file under `crates/devtools/tests/corpus_snapshots/`: the
+query and why its plan changed. Write "None" if no snapshot changed. See
+[planner snapshots](../../docs/develop_docs/planner-snapshots.md).
+
 ## Architectural decisions
 
 List consequential decisions and rejected alternatives, or state why this is not
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 450e63b22..199d810c1 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -149,3 +149,45 @@ jobs:
       run: python3 tools/verify_metricsql_vendored_baseline.py
       env:
         RUSTC_WRAPPER: sccache
+
+  # Planner snapshots (#941). A release build: the corpus queries take minutes
+  # in debug. A failure means a plan changed; the regenerated snapshots are
+  # uploaded so an intended change can be committed without a local rerun.
+  corpus-snapshots:
+    if: github.event_name != 'pull_request' || github.event.pull_request.draft == false
+    runs-on: ubuntu-latest
+    # Planning takes 2-6 min (6 min on one core) plus the release build; each
+    # query stops at 240 s.
+    timeout-minutes: 45
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install Rust
+      uses: dtolnay/rust-toolchain@stable
+      with:
+        toolchain: stable
+
+    # sccache alone: caching the release target as well would duplicate it.
+    - name: Run sccache-cache
+      uses: mozilla-actions/sccache-action@v0.0.4
+
+    - name: Cache cargo registry
+      uses: actions/cache@v4
+      with:
+        path: |
+          ~/.cargo/registry
+          ~/.cargo/git
+        key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Check planner snapshots
+      run: cargo test --release --locked -p asap-devtools --test corpus_snapshots -- --include-ignored
+      env:
+        RUSTC_WRAPPER: sccache
+
+    - name: Upload regenerated snapshots
+      if: failure()
+      uses: actions/upload-artifact@v4
+      with:
+        name: corpus-snapshots
+        path: target/tmp/corpus_snapshots/
+        if-no-files-found: ignore
diff --git a/AGENTS.md b/AGENTS.md
index dc3d1fe61..abf1b2f7f 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -28,6 +28,9 @@
   Explicitly describe **Before this PR** and **After this PR**, using an
   end-to-end example, screenshot, measurement, or diagram appropriate to the
   change.
+- A PR that changes planner snapshots
+  (`crates/devtools/tests/corpus_snapshots/`) says under **Snapshot changes**
+  which queries changed and why; a person confirms the why.
 - Agents must not complete fields reserved for human judgment, approval, or
   attestation.
 - Do not create, push, or publish commits or pull requests unless the user has
diff --git a/crates/devtools/tests/corpus_snapshots.rs b/crates/devtools/tests/corpus_snapshots.rs
new file mode 100644
index 000000000..9ffb1627f
--- /dev/null
+++ b/crates/devtools/tests/corpus_snapshots.rs
@@ -0,0 +1,382 @@
+//! Planner snapshots over real-world query corpora (#941).
+//!
+//! The planner has no reference answer, so these tests pin its output
+//! instead: each corpus query's selected plan (default search) is compared
+//! with the committed one, and any change fails until the snapshot is
+//! regenerated and the change explained in the PR.
+//!
+//! Each `tests/corpus_snapshots/<corpus>/corpus.json` declares the shared
+//! planning inputs and the queries by stable id; `<id>.json` beside it is
+//! that query's snapshot. Regenerate with
+//! `UPDATE_SNAPSHOTS=1 cargo test --release -p asap-devtools --test corpus_snapshots -- --ignored`.
+//!
+//! A snapshot holds only the plan, never the search that found it: the
+//! selected Stage 2 candidate's DAG and display name, its cost and accepted
+//! accuracy, the materialized views, pane retention, and whether the search
+//! proved the plan optimal; for a query that does not plan, the error and
+//! rejections. Candidate ids, round and evaluation counters, timings, the
+//! Stage 1 and Stage 2 candidate lists and the memo vary from run to run
+//! (round budgets are wall-clock), so they are left out. Floats are rounded
+//! to 12 significant digits. A run that the time limit stopped fails instead
+//! of being recorded, and a query with a `skip_reason` in the manifest is
+//! skipped.
+
+use std::path::{Path, PathBuf};
+use std::process::Command;
+
+use serde_json::{json, Map, Value};
+
+/// Per query. The slowest kept queries take about 60 s on one core, so this
+/// leaves room for a slower CI runner while still failing a runaway search.
+const TIME_LIMIT_S: &str = "240";
+
+fn corpora_dir() -> PathBuf {
+    PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("tests/corpus_snapshots")
+}
+
+/// `query`'s one-query workload under `corpus`'s shared inputs.
+fn workload(corpus: &Value, query: &str) -> Value {
+    let mut entry = corpus["query_workload"]["repeating_query"].clone();
+    entry["query"] = json!(query);
+    json!({
+        "query_workload": {
+            "language": corpus["query_workload"]["language"],
+            "repeating_queries": [entry],
+        },
+        "data_workload": corpus["data_workload"],
+    })
+}
+
+/// Runs `stage_pipeline` (without the memo section) on `workload`; panics
+/// (a planner crash) on failure.
+fn plan(workload: &Value, args: &[String], scratch: &Path) -> Value {
+    let input = scratch.join("workload.json");
+    let output = scratch.join("document.json");
+    std::fs::write(&input, workload.to_string()).unwrap();
+    let mut command = Command::new(env!("CARGO_BIN_EXE_stage_pipeline"));
+    command
+        .arg("--workload")
+        .arg(&input)
+        .args(["--milp-time-limit-s", TIME_LIMIT_S, "--no-memo"])
+        .args(args)
+        .arg("--out")
+        .arg(&output);
+    let result = command.output().unwrap();
+    assert!(
+        result.status.success(),
+        "{command:?} failed: {}",
+        String::from_utf8_lossy(&result.stderr)
+    );
+    serde_json::from_str(&std::fs::read_to_string(output).unwrap()).unwrap()
+}
+
+/// Whether the wall-clock budget ended the search: the final round's status
+/// says so, or planning used the whole budget. An earlier pane round cut short
+/// by its own budget is not visible in the report.
+fn hit_time_limit(document: &Value) -> bool {
+    let report = &document["stage3_plan_selection"]["search"]["candidate_connections"];
+    if report["status"] == "time_limit" {
+        return true;
+    }
+    match (
+        report["full_planning_ms"].as_f64(),
+        report["time_limit_ms"].as_f64(),
+    ) {
+        (Some(elapsed), Some(limit)) => elapsed >= limit,
+        _ => false,
+    }
+}
+
+/// `value` with every non-integer number rounded to 12 significant digits.
+fn rounded(value: &Value) -> Value {
+    match value {
+        Value::Number(n) if n.is_f64() => {
+            let x = n.as_f64().unwrap();
+            json!(format!("{x:.11e}").parse::<f64>().unwrap())
+        }
+        Value::Object(map) => {
+            Value::Object(map.iter().map(|(k, v)| (k.clone(), rounded(v))).collect())
+        }
+        Value::Array(items) => Value::Array(items.iter().map(rounded).collect()),
+        other => other.clone(),
+    }
+}
+
+/// The stable part of a `stage_pipeline` document: the selected plan and
+/// its cost, or why there is none. See the module docs.
+fn snapshot_of(document: &Value) -> Value {
+    let stage3 = &document["stage3_plan_selection"];
+    let mut snapshot = Map::new();
+    snapshot.insert(
+        "query".into(),
+        document["workload"]["queries"][0]["text"].clone(),
+    );
+    snapshot.insert(
+        "accuracy_guarantees".into(),
+        document["accuracy_guarantees"].clone(),
+    );
+    match stage3["selected"].as_str() {
+        Some(id) => {
+            let candidate = document["stage2_physical_asap_optimization"]["candidates"]
+                .as_array()
+                .and_then(|candidates| candidates.iter().find(|c| c["id"] == id))
+                .unwrap_or_else(|| panic!("selected candidate {id} is not shown"));
+            snapshot.insert(
+                "selected".into(),
+                json!({
+                    "display_name": candidate["display_name"],
+                    "dag": candidate["dag"],
+                    "cost": stage3["costs"][id],
+                    "accepted": stage3["accepted"][id],
+                }),
+            );
+            snapshot.insert(
+                "proven_optimal".into(),
+                json!(stage3["search"]["candidate_connections"]["status"] == "optimal"),
+            );
+            for key in [
+                "materialized_views",
+                "materialized_views_error",
+                "pane_retention_ms",
+                "warnings",
+            ] {
+                if let Some(value) = stage3.get(key) {
+                    snapshot.insert(key.into(), value.clone());
+                }
+            }
+        }
+        None => {
+            snapshot.insert("selected".into(), Value::Null);
+            if let Some(error) = stage3["error"].as_str() {
+                let error = error.split(" Search report: ").next().unwrap();
+                snapshot.insert("error".into(), json!(error));
+            }
+            // Which candidates were rejected depends on the search; why does not.
+            let causes = |key: &str| -> Value {
+                let mut causes: Vec<Value> = stage3[key]
+                    .as_array()
+                    .into_iter()
+                    .flatten()
+                    .map(|r| json!({"cause": r["cause"], "reason": r["reason"]}))
+                    .collect();
+                causes.sort_by_key(|c| c.to_string());
+                causes.dedup();
+                Value::Array(causes)
+            };
+            snapshot.insert("rejected".into(), causes("rejected"));
+            snapshot.insert("search_rejected".into(), causes("search_rejected"));
+        }
+    }
+    rounded(&Value::Object(snapshot))
+}
+
+/// The first line where `expected` and `actual` differ, for the failure message.
+fn first_difference(expected: &str, actual: &str) -> String {
+    let mut expected_lines = expected.lines();
+    let mut actual_lines = actual.lines();
+    for line in 1.. {
+        match (expected_lines.next(), actual_lines.next()) {
+            (None, None) => break,
+            (e, a) if e != a => {
+                return format!(
+                    "line {line}:\n  - {}\n  + {}",
+                    e.unwrap_or("<end>"),
+                    a.unwrap_or("<end>")
+                )
+            }
+            _ => {}
+        }
+    }
+    String::new()
+}
+
+/// Every corpus query's plan matches its committed snapshot.
+#[test]
+#[ignore = "runs the release planner over the corpora: see the module docs"]
+fn corpus_plans_match_snapshots() {
+    let update = std::env::var_os("UPDATE_SNAPSHOTS").is_some();
+    // Regenerated snapshots of failing queries, with their full
+    // `stage_pipeline` documents for the DAG viewer, for CI to upload.
+    let regenerated = PathBuf::from(env!("CARGO_TARGET_TMPDIR")).join("corpus_snapshots");
+    let _ = std::fs::remove_dir_all(&regenerated);
+    let scratch = std::env::temp_dir().join(format!("corpus_snapshots_{}", std::process::id()));
+    std::fs::create_dir_all(&scratch).unwrap();
+    let mut failures = Vec::new();
+
+    let mut corpora: Vec<_> = std::fs::read_dir(corpora_dir())
+        .unwrap()
+        .map(|entry| entry.unwrap().path())
+        .collect();
+    corpora.sort();
+    for dir in corpora {
+        let name = dir.file_name().unwrap().to_string_lossy().into_owned();
+        let corpus: Value =
+            serde_json::from_str(&std::fs::read_to_string(dir.join("corpus.json")).unwrap())
+                .unwrap();
+        let args: Vec<String> =
+            serde_json::from_value(corpus["stage_pipeline_args"].clone()).unwrap();
+        // A query with a `skip_reason` is not planned.
+        let queries: Vec<&Value> = corpus["queries"]
+            .as_array()
+            .unwrap()
+            .iter()
+            .filter(|q| q.get("skip_reason").is_none())
+            .collect();
+        let ids: Vec<&str> = queries.iter().map(|q| q["id"].as_str().unwrap()).collect();
+
+        // A snapshot whose query left the manifest, or became known-slow,
+        // would otherwise go stale unseen.
+        for entry in std::fs::read_dir(&dir).unwrap() {
+            let file = entry.unwrap().file_name().to_string_lossy().into_owned();
+            if let Some(id) = file.strip_suffix(".json") {
+                if id != "corpus" && !ids.contains(&id) {
+                    failures.push(format!("{name}/{file}: no checked query with id {id}"));
+                }
+            }
+        }
+
+        for query in queries {
+            let id = query["id"].as_str().unwrap();
+            let document = plan(
+                &workload(&corpus, query["query"].as_str().unwrap()),
+                &args,
+                &scratch,
+            );
+            if hit_time_limit(&document) {
+                failures.push(format!(
+                    "{name}/{id}: the {TIME_LIMIT_S} s time limit ended the search, \
+                     so its plan depends on machine speed"
+                ));
+                continue;
+            }
+            let actual = serde_json::to_string_pretty(&snapshot_of(&document)).unwrap() + "\n";
+            let path = dir.join(format!("{id}.json"));
+            if update {
+                std::fs::write(&path, &actual).unwrap();
+                continue;
+            }
+            let expected = std::fs::read_to_string(&path).unwrap_or_default();
+            if expected != actual {
+                let out = regenerated.join(&name);
+                std::fs::create_dir_all(&out).unwrap();
+                std::fs::write(out.join(format!("{id}.json")), &actual).unwrap();
+                std::fs::write(
+                    out.join(format!("{id}.document.json")),
+                    serde_json::to_string_pretty(&document).unwrap(),
+                )
+                .unwrap();
+                failures.push(format!(
+                    "{name}/{id}: plan changed at {}",
+                    first_difference(&expected, &actual)
+                ));
+            }
+        }
+    }
+    std::fs::remove_dir_all(&scratch).unwrap();
+    assert!(
+        failures.is_empty(),
+        "{} snapshot(s) differ; regenerated ones are in {}.\n\
+         If the change is intended, run with UPDATE_SNAPSHOTS=1 and explain it \
+         under \"Snapshot changes\" in the PR.\n\n{}",
+        failures.len(),
+        regenerated.display(),
+        failures.join("\n\n")
+    );
+}
+
+/// The snapshot keeps the selected plan without its id or the search
+/// report, and rounds floats.
+#[test]
+fn snapshot_keeps_only_the_plan() {
+    let document = json!({
+        "accuracy_guarantees": "enforced",
+        "workload": {"queries": [{"text": "sum(up)"}]},
+        "stage2_physical_asap_optimization": {"candidates": [
+            {"id": "pane-round-12-joint-plan-1", "display_name": "plan A", "dag": {"nodes": [1]}},
+        ]},
+        "stage3_plan_selection": {
+            "selected": "pane-round-12-joint-plan-1",
+            "costs": {"pane-round-12-joint-plan-1": {"cost_per_second": 0.1 + 0.2}},
+            "accepted": {"pane-round-12-joint-plan-1": []},
+            "materialized_views": [],
+            "pane_retention_ms": {"1": 60000},
+            "search": {"candidate_connections": {"status": "refinement_limit", "solver_ms": 1.5}},
+        },
+    });
+    assert_eq!(
+        snapshot_of(&document),
+        json!({
+            "query": "sum(up)",
+            "accuracy_guarantees": "enforced",
+            "selected": {
+                "display_name": "plan A",
+                "dag": {"nodes": [1]},
+                "cost": {"cost_per_second": 0.3},
+                "accepted": [],
+            },
+            "proven_optimal": false,
+            "materialized_views": [],
+            "pane_retention_ms": {"1": 60000},
+        })
+    );
+}
+
+/// A query without a plan keeps the error up to the embedded search report
+/// and the rejections' causes without candidate ids.
+#[test]
+fn snapshot_of_a_failed_query() {
+    let document = json!({
+        "accuracy_guarantees": "enforced",
+        "workload": {"queries": [{"text": "sum(up)"}]},
+        "stage3_plan_selection": {
+            "selected": null,
+            "error": "infeasible. Search report: {\"solver_ms\":1.5}",
+            "rejected": [
+                {"id": "joint-plan-2", "cause": "costlier", "reason": "r"},
+                {"id": "joint-plan-1", "cause": "costlier", "reason": "r"},
+            ],
+        },
+    });
+    assert_eq!(
+        snapshot_of(&document),
+        json!({
+            "query": "sum(up)",
+            "accuracy_guarantees": "enforced",
+            "selected": null,
+            "error": "infeasible.",
+            "rejected": [{"cause": "costlier", "reason": "r"}],
+            "search_rejected": [],
+        })
+    );
+}
+
+/// A search that used its whole wall-clock budget, or reports `time_limit`
+/// (a round budget), is detected; one stopped by the evaluation budget, or
+/// with no search report, is not.
+#[test]
+fn time_limit_detection() {
+    let report = |elapsed: f64, status: &str| {
+        json!({"stage3_plan_selection": {"search": {"candidate_connections": {
+            "full_planning_ms": elapsed, "time_limit_ms": 1000.0, "status": status,
+        }}}})
+    };
+    assert!(hit_time_limit(&report(1000.2, "refinement_limit")));
+    assert!(hit_time_limit(&report(12.0, "time_limit")));
+    assert!(!hit_time_limit(&report(12.0, "refinement_limit")));
+    assert!(!hit_time_limit(
+        &json!({"stage3_plan_selection": {"error": "x"}})
+    ));
+}
+
+/// The failure message names the first differing line.
+#[test]
+fn first_difference_names_the_line() {
+    assert_eq!(
+        first_difference("a\nb\n", "a\nc\n"),
+        "line 2:\n  - b\n  + c"
+    );
+    assert_eq!(
+        first_difference("a\n", "a\nb\n"),
+        "line 2:\n  - <end>\n  + b"
+    );
+}
diff --git a/crates/devtools/tests/corpus_snapshots/o11y_bench/corpus.json b/crates/devtools/tests/corpus_snapshots/o11y_bench/corpus.json
new file mode 100644
index 000000000..1b55ea4d7
--- /dev/null
+++ b/crates/devtools/tests/corpus_snapshots/o11y_bench/corpus.json
@@ -0,0 +1,133 @@
+{
+  "source": "crates/frontend-promql/tests/observability/data/o11y_bench_promql.txt",
+  "stage_pipeline_args": [
+    "--enforce-accuracy-guarantees"
+  ],
+  "query_workload": {
+    "language": "promql",
+    "repeating_query": {
+      "demand": {
+        "fixed_interval": 60000
+      },
+      "requirements": {
+        "accuracy": {
+          "max_error": 0.01,
+          "failure_probability": 0.001
+        }
+      },
+      "predictability": {
+        "predictable": {
+          "known_at": null
+        }
+      },
+      "range_evaluation": {
+        "step_ms": 60000,
+        "span_ms": 3600000
+      }
+    }
+  },
+  "data_workload": {
+    "sources": {
+      "http_requests_total": {
+        "sample_interval": 1000,
+        "series_count": 1000,
+        "metric_type": "counter"
+      },
+      "http_request_duration_seconds_bucket": {
+        "sample_interval": 1000,
+        "series_count": 1000,
+        "metric_type": "counter"
+      },
+      "service_cache_refresh_lag_seconds": {
+        "sample_interval": 1000,
+        "series_count": 1000,
+        "metric_type": "gauge"
+      },
+      "service_retry_queue_depth": {
+        "sample_interval": 1000,
+        "series_count": 1000,
+        "metric_type": "gauge"
+      },
+      "process_resident_memory_bytes": {
+        "sample_interval": 1000,
+        "series_count": 1000,
+        "metric_type": "gauge"
+      },
+      "process_cpu_seconds_total": {
+        "sample_interval": 1000,
+        "series_count": 1000,
+        "metric_type": "counter"
+      },
+      "up": {
+        "sample_interval": 1000,
+        "series_count": 1000,
+        "metric_type": "gauge"
+      }
+    },
+    "arrival": {
+      "ingesting": {
+        "rows_per_second": 7000.0
+      }
+    }
+  },
+  "queries": [
+    {
+      "id": "q02",
+      "query": "histogram_quantile(0.95, sum(rate(http_request_duration_seconds_bucket{job=\"order-service\"}[5m])) by (le))"
+    },
+    {
+      "id": "q05",
+      "query": "max_over_time((sum(rate(http_requests_total{job=\"order-service\",status=~\"5..\"}[5m])) / sum(rate(http_requests_total{job=\"order-service\"}[5m])))[6h:1m])"
+    },
+    {
+      "id": "q06",
+      "query": "max_over_time(histogram_quantile(0.95, sum(rate(http_request_duration_seconds_bucket{job=\"user-service\"}[5m])) by (le))[12h:1m])"
+    },
+    {
+      "id": "q11",
+      "query": "max_over_time(sum(process_resident_memory_bytes)[6h:1m])"
+    },
+    {
+      "id": "q12",
+      "query": "service_cache_refresh_lag_seconds{job=\"user-service\"}"
+    },
+    {
+      "id": "q18",
+      "query": "sum(increase(http_requests_total{job=\"payment-service\",status=~\"5..\"}[1h] offset 6h)) / sum(increase(http_requests_total{job=\"payment-service\"}[1h] offset 6h))",
+      "skip_reason": "planning runs past the time limit on main (#1023)"
+    },
+    {
+      "id": "q19",
+      "query": "sum(increase(http_requests_total{job=\"payment-service\",status=~\"5..\"}[1h])) / sum(increase(http_requests_total{job=\"payment-service\"}[1h]))"
+    },
+    {
+      "id": "q20",
+      "query": "sum(process_resident_memory_bytes)"
+    },
+    {
+      "id": "q21",
+      "query": "sum(rate(http_requests_total{job=\"order-service\"}[5m] offset 1h))",
+      "skip_reason": "a pane round can end on its wall-clock budget (status time_limit), so the result depends on machine speed; about 70 s and 400 MB on one core"
+    },
+    {
+      "id": "q22",
+      "query": "sum(rate(http_requests_total{job=\"order-service\"}[5m]))"
+    },
+    {
+      "id": "q23",
+      "query": "sum(rate(http_requests_total{job=~\"user-service|order-service|payment-service\"}[5m]))"
+    },
+    {
+      "id": "q25",
+      "query": "sum(rate(http_requests_total{status=~\"5..\",job=~\"user-service|order-service|payment-service\"}[1h])) / sum(rate(http_requests_total{job=~\"user-service|order-service|payment-service\"}[1h]))"
+    },
+    {
+      "id": "q26",
+      "query": "sum(rate(process_cpu_seconds_total[1h]))"
+    },
+    {
+      "id": "q27",
+      "query": "sum(up)"
+    }
+  ]
+}
diff --git a/crates/devtools/tests/corpus_snapshots/o11y_bench/q02.json b/crates/devtools/tests/corpus_snapshots/o11y_bench/q02.json
new file mode 100644
index 000000000..4fbf612da
--- /dev/null
+++ b/crates/devtools/tests/corpus_snapshots/o11y_bench/q02.json
@@ -0,0 +1,1318 @@
+{
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+              }
+            ],
+            "time_index": 0,
+            "unique_keys": [
+              [
+                4,
+                0
+              ]
+            ]
+          },
+          "output_state": {
+            "primitive": "SummaryState",
+            "timing": "ingestion_time"
+          },
+          "payload": {
+            "ASAP": {
+              "PaneChain": {
+                "child": 0,
+                "family": {
+                  "ExactAggregate": [
+                    "Rate",
+                    "Rate"
+                  ]
+                },
+                "filter": null,
+                "grouping": "PerSubpopulationInstance",
+                "input": {
+                  "item": null,
+                  "weight": {
+                    "Column": "SampleValue"
+                  },
+                  "weight_domain": {
+                    "kind": "unknown_or_signed"
+                  }
+                },
+                "pane_count": 5,
+                "pane_width_ms": 60000,
+                "reduction": "PerEntity"
+              }
+            }
+          }
+        },
+        {
+          "guarantee": null,
+          "id": 2,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "timestamp"
+                },
+                "name": "ts",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "ExactAggregate": [
+                    "Rate",
+                    "Rate"
+                  ]
+                },
+                "name": "state",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "job",
+                "nullable": true,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "le",
+                "nullable": true,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "$promql_series_identity",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": 0,
+            "unique_keys": [
+              [
+                4,
+                0
+              ]
+            ]
+          },
+          "output_state": {
+            "primitive": "SummaryState",
+            "timing": "query_time"
+          },
+          "payload": {
+            "ASAP": {
+              "SummaryMerge": {
+                "children": [
+                  1
+                ]
+              }
+            }
+          }
+        },
+        {
+          "guarantee": {
+            "provenance": [
+              {
+                "kind": "exact",
+                "reason": "exact accumulator over exact input"
+              }
+            ],
+            "spec": {
+              "accuracy_metric": "absolute",
+              "accuracy_scope": "per_value",
+              "error": {
+                "op": "zero"
+              },
+              "failure_probability": {
+                "op": "zero"
+              }
+            }
+          },
+          "id": 3,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "timestamp"
+                },
+                "name": "ts",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "float64"
+                },
+                "name": "value",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "job",
+                "nullable": true,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "le",
+                "nullable": true,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "$promql_series_identity",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": 0,
+            "unique_keys": [
+              [
+                4,
+                0
+              ]
+            ]
+          },
+          "output_state": {
+            "primitive": "Raw",
+            "timing": "query_time"
+          },
+          "payload": {
+            "ASAP": {
+              "FinalizeExactAccumulator": {
+                "child": 2
+              }
+            }
+          }
+        },
+        {
+          "guarantee": null,
+          "id": 4,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "le",
+                "nullable": true,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "ExactAggregate": [
+                    "Sum",
+                    "Sum"
+                  ]
+                },
+                "name": "state",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": null,
+            "unique_keys": [
+              [
+                0
+              ]
+            ]
+          },
+          "output_state": {
+            "primitive": "SummaryState",
+            "timing": "query_time"
+          },
+          "payload": {
+            "ASAP": {
+              "SummaryAgg": {
+                "child": 3,
+                "family": {
+                  "ExactAggregate": [
+                    "Sum",
+                    "Sum"
+                  ]
+                },
+                "filter": null,
+                "grouping": "PerSubpopulationInstance",
+                "input": {
+                  "item": null,
+                  "weight": {
+                    "Column": "SampleValue"
+                  },
+                  "weight_domain": {
+                    "kind": "unknown_or_signed"
+                  }
+                },
+                "reduction": {
+                  "Reduce": [
+                    3
+                  ]
+                }
+              }
+            }
+          }
+        },
+        {
+          "guarantee": {
+            "provenance": [
+              {
+                "kind": "exact",
+                "reason": "exact accumulator over exact input"
+              }
+            ],
+            "spec": {
+              "accuracy_metric": "absolute",
+              "accuracy_scope": "per_value",
+              "error": {
+                "op": "zero"
+              },
+              "failure_probability": {
+                "op": "zero"
+              }
+            }
+          },
+          "id": 5,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "le",
+                "nullable": true,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "float64"
+                },
+                "name": "sum",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": null,
+            "unique_keys": [
+              [
+                0
+              ]
+            ]
+          },
+          "output_state": {
+            "primitive": "Raw",
+            "timing": "query_time"
+          },
+          "payload": {
+            "ASAP": {
+              "FinalizeExactAccumulator": {
+                "child": 4
+              }
+            }
+          }
+        },
+        {
+          "guarantee": {
+            "provenance": [
+              {
+                "kind": "exact",
+                "reason": "exact over exact inputs"
+              }
+            ],
+            "spec": {
+              "accuracy_metric": "absolute",
+              "accuracy_scope": "per_value",
+              "error": {
+                "op": "zero"
+              },
+              "failure_probability": {
+                "op": "zero"
+              }
+            }
+          },
+          "id": 6,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": false,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "float64"
+                },
+                "name": "histogram_quantile",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": null,
+            "unique_keys": []
+          },
+          "output_state": {
+            "primitive": "Raw",
+            "timing": "query_time"
+          },
+          "payload": {
+            "NonASAP": {
+              "Aggregate": {
+                "child": 5,
+                "filters": [],
+                "having": null,
+                "measures": [
+                  {
+                    "kind": "histogram_quantile",
+                    "le": 0,
+                    "q": 0.95
+                  }
+                ],
+                "output_names": [
+                  ""
+                ],
+                "reduction": {
+                  "Reduce": {
+                    "without": [
+                      0
+                    ]
+                  }
+                }
+              }
+            }
+          }
+        }
+      ],
+      "roots": [
+        6
+      ],
+      "scalar_roots": []
+    },
+    "display_name": "Q1 Sum acc + Rate acc ×5 panes · ingestion time: Rate acc for Q1, 5 × 1m panes"
+  }
+}
diff --git a/crates/devtools/tests/corpus_snapshots/o11y_bench/q05.json b/crates/devtools/tests/corpus_snapshots/o11y_bench/q05.json
new file mode 100644
index 000000000..a26dc0dc6
--- /dev/null
+++ b/crates/devtools/tests/corpus_snapshots/o11y_bench/q05.json
@@ -0,0 +1,8 @@
+{
+  "accuracy_guarantees": "enforced",
+  "error": "MILP solver: candidate-connections: planning budget ended before either seed or complete search found a validated incumbent.",
+  "query": "max_over_time((sum(rate(http_requests_total{job=\"order-service\",status=~\"5..\"}[5m])) / sum(rate(http_requests_total{job=\"order-service\"}[5m])))[6h:1m])",
+  "rejected": [],
+  "search_rejected": [],
+  "selected": null
+}
diff --git a/crates/devtools/tests/corpus_snapshots/o11y_bench/q06.json b/crates/devtools/tests/corpus_snapshots/o11y_bench/q06.json
new file mode 100644
index 000000000..e66c8366a
--- /dev/null
+++ b/crates/devtools/tests/corpus_snapshots/o11y_bench/q06.json
@@ -0,0 +1,8 @@
+{
+  "accuracy_guarantees": "enforced",
+  "error": "MILP solver: candidate-connections: planning budget ended before either seed or complete search found a validated incumbent.",
+  "query": "max_over_time(histogram_quantile(0.95, sum(rate(http_request_duration_seconds_bucket{job=\"user-service\"}[5m])) by (le))[12h:1m])",
+  "rejected": [],
+  "search_rejected": [],
+  "selected": null
+}
diff --git a/crates/devtools/tests/corpus_snapshots/o11y_bench/q11.json b/crates/devtools/tests/corpus_snapshots/o11y_bench/q11.json
new file mode 100644
index 000000000..216bf9953
--- /dev/null
+++ b/crates/devtools/tests/corpus_snapshots/o11y_bench/q11.json
@@ -0,0 +1,8 @@
+{
+  "accuracy_guarantees": "enforced",
+  "error": "MILP solver: candidate-connections: generated candidate catalog is infeasible under the configured model.",
+  "query": "max_over_time(sum(process_resident_memory_bytes)[6h:1m])",
+  "rejected": [],
+  "search_rejected": [],
+  "selected": null
+}
diff --git a/crates/devtools/tests/corpus_snapshots/o11y_bench/q12.json b/crates/devtools/tests/corpus_snapshots/o11y_bench/q12.json
new file mode 100644
index 000000000..793450243
--- /dev/null
+++ b/crates/devtools/tests/corpus_snapshots/o11y_bench/q12.json
@@ -0,0 +1,348 @@
+{
+  "accuracy_guarantees": "enforced",
+  "materialized_views": [],
+  "pane_retention_ms": {},
+  "proven_optimal": true,
+  "query": "service_cache_refresh_lag_seconds{job=\"user-service\"}",
+  "selected": {
+    "accepted": [
+      {
+        "accepted_metric": null,
+        "accepted_regardless_of_guarantee": false,
+        "guarantee_check_rejection": null,
+        "sketches": [],
+        "summary": "metric not set; accepted exact",
+        "target_metric": null
+      }
+    ],
+    "cost": {
+      "cost_per_second": 0.00691333341629,
+      "cost_unit": "cost_per_second",
+      "cpu_core_seconds_per_second": 6.91333333333e-6,
+      "per_node": {
+        "0": {
+          "cost_per_second": 0.00589666670815,
+          "cpu_core_seconds_per_second": 5.89666666667e-6,
+          "detail": "scan 1000 samples; x 1.0167/s; keeps 48000 bytes of raw data on disk; holds 48 bytes for 0.0 ms",
+          "multiplier": 1,
+          "operator": "Scan",
+          "price_source": "analytical",
+          "timing": "query_time"
+        },
+        "1": {
+          "cost_per_second": 0.00101666670815,
+          "cpu_core_seconds_per_second": 1.01666666667e-6,
+          "detail": "time range 1s: keep 1000 of 1000 rows; x 1.0167/s; holds 48 bytes for 0.0 ms",
+          "multiplier": 1,
+          "operator": "TimeRange",
+          "price_source": "analytical",
+          "timing": "query_time"
+        }
+      },
+      "source": "analytical-cost-v2 (illustrative statistics)",
+      "usage": {
+        "average_memory_bytes": 0.00066368,
+        "cpu_ops_per_second": 2033.33333333,
+        "disk_bytes": 48000,
+        "latency_per_query": [
+          {
+            "compaction_ms": 0.0,
+            "query_ms": 0.0068
+          }
+        ],
+        "peak_cpu_cores": 1,
+        "peak_memory_bytes": 96,
+        "scanned_bytes_per_second": 48800.0
+      }
+    },
+    "dag": {
+      "edges": [
+        {
+          "consumer": 1,
+          "data_state": {
+            "primitive": "Raw",
+            "timing": "query_time"
+          },
+          "grouping": "NotApplicable",
+          "intermediate_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "timestamp"
+                },
+                "name": "ts",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "float64"
+                },
+                "name": "value",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "job",
+                "nullable": true,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "$promql_series_identity",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": 0,
+            "unique_keys": [
+              [
+                3,
+                0
+              ]
+            ]
+          },
+          "producer": 0,
+          "role": "Input",
+          "window": "NotApplicable"
+        }
+      ],
+      "nodes": [
+        {
+          "guarantee": {
+            "provenance": [
+              {
+                "kind": "exact",
+                "reason": "exact over exact inputs"
+              }
+            ],
+            "spec": {
+              "accuracy_metric": "absolute",
+              "accuracy_scope": "per_value",
+              "error": {
+                "op": "zero"
+              },
+              "failure_probability": {
+                "op": "zero"
+              }
+            }
+          },
+          "id": 0,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "timestamp"
+                },
+                "name": "ts",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "float64"
+                },
+                "name": "value",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "job",
+                "nullable": true,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "$promql_series_identity",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": 0,
+            "unique_keys": [
+              [
+                3,
+                0
+              ]
+            ]
+          },
+          "output_state": {
+            "primitive": "Raw",
+            "timing": "query_time"
+          },
+          "payload": {
+            "NonASAP": {
+              "Scan": {
+                "predicates": [
+                  {
+                    "Compare": {
+                      "left": {
+                        "Column": 2
+                      },
+                      "op": "Eq",
+                      "right": {
+                        "Literal": {
+                          "Utf8": "user-service"
+                        }
+                      },
+                      "semantics": "promql"
+                    }
+                  }
+                ],
+                "schema": {
+                  "closed": true,
+                  "fields": [
+                    {
+                      "dtype": {
+                        "Plain": "timestamp"
+                      },
+                      "name": "ts",
+                      "nullable": false,
+                      "table": null
+                    },
+                    {
+                      "dtype": {
+                        "Plain": "float64"
+                      },
+                      "name": "value",
+                      "nullable": false,
+                      "table": null
+                    },
+                    {
+                      "dtype": {
+                        "Plain": "utf8"
+                      },
+                      "name": "job",
+                      "nullable": true,
+                      "table": null
+                    },
+                    {
+                      "dtype": {
+                        "Plain": "utf8"
+                      },
+                      "name": "$promql_series_identity",
+                      "nullable": false,
+                      "table": null
+                    }
+                  ],
+                  "time_index": 0,
+                  "unique_keys": [
+                    [
+                      3,
+                      0
+                    ]
+                  ]
+                },
+                "source": {
+                  "TimeSeries": {
+                    "metric": "service_cache_refresh_lag_seconds"
+                  }
+                }
+              }
+            }
+          }
+        },
+        {
+          "guarantee": {
+            "provenance": [
+              {
+                "kind": "exact",
+                "reason": "exact over exact inputs"
+              }
+            ],
+            "spec": {
+              "accuracy_metric": "absolute",
+              "accuracy_scope": "per_value",
+              "error": {
+                "op": "zero"
+              },
+              "failure_probability": {
+                "op": "zero"
+              }
+            }
+          },
+          "id": 1,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "timestamp"
+                },
+                "name": "ts",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "float64"
+                },
+                "name": "value",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "job",
+                "nullable": true,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "$promql_series_identity",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": 0,
+            "unique_keys": [
+              [
+                3,
+                0
+              ]
+            ]
+          },
+          "output_state": {
+            "primitive": "Raw",
+            "timing": "query_time"
+          },
+          "payload": {
+            "NonASAP": {
+              "TimeRange": {
+                "child": 0,
+                "kind": "instant",
+                "range": {
+                  "nanos": 0,
+                  "secs": 1
+                }
+              }
+            }
+          }
+        }
+      ],
+      "roots": [
+        1
+      ],
+      "scalar_roots": []
+    },
+    "display_name": "Q1 exact"
+  }
+}
diff --git a/crates/devtools/tests/corpus_snapshots/o11y_bench/q19.json b/crates/devtools/tests/corpus_snapshots/o11y_bench/q19.json
new file mode 100644
index 000000000..6407c1c06
--- /dev/null
+++ b/crates/devtools/tests/corpus_snapshots/o11y_bench/q19.json
@@ -0,0 +1,8059 @@
+{
+  "accuracy_guarantees": "enforced",
+  "materialized_views": [
+    {
+      "coverage": {
+        "definition_id": "6fea1c63a2fdd67d8f43d0106be9d627",
+        "selection": [
+          {
+            "columns": [
+              {
+                "column": {
+                  "name": "job",
+                  "table": null
+                },
+                "constraint": {
+                  "in": [
+                    {
+                      "Utf8": "payment-service"
+                    }
+                  ]
+                }
+              }
+            ],
+            "relative_time": [
+              {
+                "excluded": -60000
+              },
+              {
+                "included": 0
+              }
+            ]
+          }
+        ]
+      },
+      "inputs": {
+        "materialized_views": [],
+        "raw_data_windows": [
+          {
+            "end_offset_ms": 0,
+            "source": {
+              "TimeSeries": {
+                "metric": "http_requests_total"
+              }
+            },
+            "width_ms": 60000
+          }
+        ]
+      },
+      "installed_count": 60,
+      "installed_position": 0,
+      "node_id": 2,
+      "refresh": "at_ingestion",
+      "retention_ms": 7200000,
+      "stage2_node_id": 1
+    },
+    {
+      "coverage": {
+        "definition_id": "6fea1c63a2fdd67d8f43d0106be9d627",
+        "selection": [
+          {
+            "columns": [
+              {
+                "column": {
+                  "name": "job",
+                  "table": null
+                },
+                "constraint": {
+                  "in": [
+                    {
+                      "Utf8": "payment-service"
+                    }
+                  ]
+                }
+              }
+            ],
+            "relative_time": [
+              {
+                "excluded": -120000
+              },
+              {
+                "included": -60000
+              }
+            ]
+          }
+        ]
+      },
+      "inputs": {
+        "materialized_views": [],
+        "raw_data_windows": [
+          {
+            "end_offset_ms": 60000,
+            "source": {
+              "TimeSeries": {
+                "metric": "http_requests_total"
+              }
+            },
+            "width_ms": 60000
+          }
+        ]
+      },
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+                  "Reduce": []
+                }
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+          }
+        },
+        {
+          "guarantee": {
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+                "kind": "exact",
+                "reason": "exact accumulator over exact input"
+              }
+            ],
+            "spec": {
+              "accuracy_metric": "absolute",
+              "accuracy_scope": "per_value",
+              "error": {
+                "op": "zero"
+              },
+              "failure_probability": {
+                "op": "zero"
+              }
+            }
+          },
+          "id": 11,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
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+            "unique_keys": []
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+          "output_state": {
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+            "timing": "query_time"
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+            "ASAP": {
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+        {
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+                "reason": "exact over exact inputs"
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+              "failure_probability": {
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+            }
+          },
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+            "closed": true,
+            "fields": [
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+            "unique_keys": []
+          },
+          "output_state": {
+            "primitive": "Raw",
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+          },
+          "payload": {
+            "NonASAP": {
+              "BinaryOp": {
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+                "operator": {
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+                  "checked_relative_division": false,
+                  "kind": {
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+              }
+            }
+          }
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+      ],
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+      ],
+      "scalar_roots": []
+    },
+    "display_name": "Q1 Sum acc + Increase acc ×60 panes · ingestion time: Increase acc for Q1, 60 × 1m panes, Increase acc for Q1, 60 × 1m panes"
+  }
+}
diff --git a/crates/devtools/tests/corpus_snapshots/o11y_bench/q20.json b/crates/devtools/tests/corpus_snapshots/o11y_bench/q20.json
new file mode 100644
index 000000000..fa6086fe5
--- /dev/null
+++ b/crates/devtools/tests/corpus_snapshots/o11y_bench/q20.json
@@ -0,0 +1,497 @@
+{
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+  "pane_retention_ms": {},
+  "proven_optimal": true,
+  "query": "sum(process_resident_memory_bytes)",
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+        "accepted_regardless_of_guarantee": false,
+        "guarantee_check_rejection": null,
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+          "multiplier": 1,
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+          "cpu_core_seconds_per_second": 1.01666666667e-6,
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+          "cpu_core_seconds_per_second": 1.01666666667e-9,
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+            "closed": true,
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+                "reason": "exact over exact inputs"
+              }
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+                "kind": "instant",
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+            "fields": [
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+            "timing": "query_time"
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+                "family": {
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+                "grouping": "PerSubpopulationInstance",
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+            }
+          }
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+          "guarantee": {
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+                "kind": "exact",
+                "reason": "exact accumulator over exact input"
+              }
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+            "spec": {
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+              "accuracy_scope": "per_value",
+              "error": {
+                "op": "zero"
+              },
+              "failure_probability": {
+                "op": "zero"
+              }
+            }
+          },
+          "id": 3,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
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+                "dtype": {
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+                },
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+              }
+            ],
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+            "unique_keys": []
+          },
+          "output_state": {
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+            "timing": "query_time"
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+          "payload": {
+            "ASAP": {
+              "FinalizeExactAccumulator": {
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+              }
+            }
+          }
+        }
+      ],
+      "roots": [
+        3
+      ],
+      "scalar_roots": []
+    },
+    "display_name": "Q1 Sum acc"
+  }
+}
diff --git a/crates/devtools/tests/corpus_snapshots/o11y_bench/q22.json b/crates/devtools/tests/corpus_snapshots/o11y_bench/q22.json
new file mode 100644
index 000000000..f149338cc
--- /dev/null
+++ b/crates/devtools/tests/corpus_snapshots/o11y_bench/q22.json
@@ -0,0 +1,1094 @@
+{
+  "accuracy_guarantees": "enforced",
+  "materialized_views": [
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+                      "Utf8": "order-service"
+                    }
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+            "source": {
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+      "refresh": "at_ingestion",
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+      "stage2_node_id": 1
+    },
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+        "selection": [
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+                "column": {
+                  "name": "job",
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+                },
+                "constraint": {
+                  "in": [
+                    {
+                      "Utf8": "order-service"
+                    }
+                  ]
+                }
+              }
+            ],
+            "relative_time": [
+              {
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+              },
+              {
+                "included": -240000
+              }
+            ]
+          }
+        ]
+      },
+      "inputs": {
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+          }
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+      "stage2_node_id": 1
+    }
+  ],
+  "pane_retention_ms": {
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+  },
+  "proven_optimal": false,
+  "query": "sum(rate(http_requests_total{job=\"order-service\"}[5m]))",
+  "selected": {
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+        "accepted_regardless_of_guarantee": false,
+        "guarantee_check_rejection": null,
+        "sketches": [],
+        "summary": "metric not set; accepted exact",
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+            "timing": "query_time"
+          },
+          "payload": {
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+              }
+            }
+          }
+        },
+        {
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+          "id": 4,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
+              {
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+                    "Sum",
+                    "Sum"
+                  ]
+                },
+                "name": "state",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": null,
+            "unique_keys": []
+          },
+          "output_state": {
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+            "timing": "query_time"
+          },
+          "payload": {
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+                "family": {
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+                    "Sum",
+                    "Sum"
+                  ]
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+                "grouping": "PerSubpopulationInstance",
+                "input": {
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+                  "weight": {
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+                  },
+                  "weight_domain": {
+                    "kind": "unknown_or_signed"
+                  }
+                },
+                "reduction": {
+                  "Reduce": []
+                }
+              }
+            }
+          }
+        },
+        {
+          "guarantee": {
+            "provenance": [
+              {
+                "kind": "exact",
+                "reason": "exact accumulator over exact input"
+              }
+            ],
+            "spec": {
+              "accuracy_metric": "absolute",
+              "accuracy_scope": "per_value",
+              "error": {
+                "op": "zero"
+              },
+              "failure_probability": {
+                "op": "zero"
+              }
+            }
+          },
+          "id": 5,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "float64"
+                },
+                "name": "sum",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": null,
+            "unique_keys": []
+          },
+          "output_state": {
+            "primitive": "Raw",
+            "timing": "query_time"
+          },
+          "payload": {
+            "ASAP": {
+              "FinalizeExactAccumulator": {
+                "child": 4
+              }
+            }
+          }
+        }
+      ],
+      "roots": [
+        5
+      ],
+      "scalar_roots": []
+    },
+    "display_name": "Q1 Sum acc + Rate acc ×5 panes · ingestion time: Rate acc for Q1, 5 × 1m panes"
+  }
+}
diff --git a/crates/devtools/tests/corpus_snapshots/o11y_bench/q23.json b/crates/devtools/tests/corpus_snapshots/o11y_bench/q23.json
new file mode 100644
index 000000000..6be0b5b7c
--- /dev/null
+++ b/crates/devtools/tests/corpus_snapshots/o11y_bench/q23.json
@@ -0,0 +1,1024 @@
+{
+  "accuracy_guarantees": "enforced",
+  "materialized_views": [
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+      "refresh": "at_ingestion",
+      "retention_ms": 3900000,
+      "stage2_node_id": 1
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+            "source": {
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+                "metric": "http_requests_total"
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+            "width_ms": 60000
+          }
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+      "installed_position": 1,
+      "node_id": 5,
+      "refresh": "at_ingestion",
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+      "stage2_node_id": 1
+    },
+    {
+      "coverage": {
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+            "timing": "ingestion_time"
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+                      "op": "Regex",
+                      "right": {
+                        "Literal": {
+                          "Utf8": "user-service|order-service|payment-service"
+                        }
+                      },
+                      "semantics": "promql"
+                    }
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+                ],
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+                  "unique_keys": [
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+                    ]
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+                    "metric": "http_requests_total"
+                  }
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+              }
+            }
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+            "fields": [
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+                    "Rate"
+                  ]
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+              {
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+                "table": null
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+              {
+                "dtype": {
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+                },
+                "name": "$promql_series_identity",
+                "nullable": false,
+                "table": null
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+            "unique_keys": [
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+            "timing": "ingestion_time"
+          },
+          "payload": {
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+                "family": {
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+                    "Rate"
+                  ]
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+                "filter": null,
+                "grouping": "PerSubpopulationInstance",
+                "input": {
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+                  "weight": {
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+                  }
+                },
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+                "pane_width_ms": 60000,
+                "reduction": "PerEntity"
+              }
+            }
+          }
+        },
+        {
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+          "materialization": "NotMaterialized",
+          "output_schema": {
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+            "fields": [
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+                  1
+                ]
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+          }
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+              }
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+          "materialization": "NotMaterialized",
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+            "fields": [
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+              {
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+            "unique_keys": [
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+          "output_state": {
+            "primitive": "Raw",
+            "timing": "query_time"
+          },
+          "payload": {
+            "ASAP": {
+              "FinalizeExactAccumulator": {
+                "child": 2
+              }
+            }
+          }
+        },
+        {
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+          "id": 4,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "ExactAggregate": [
+                    "Sum",
+                    "Sum"
+                  ]
+                },
+                "name": "state",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": null,
+            "unique_keys": []
+          },
+          "output_state": {
+            "primitive": "SummaryState",
+            "timing": "query_time"
+          },
+          "payload": {
+            "ASAP": {
+              "SummaryAgg": {
+                "child": 3,
+                "family": {
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+                    "Sum",
+                    "Sum"
+                  ]
+                },
+                "filter": null,
+                "grouping": "PerSubpopulationInstance",
+                "input": {
+                  "item": null,
+                  "weight": {
+                    "Column": "SampleValue"
+                  },
+                  "weight_domain": {
+                    "kind": "unknown_or_signed"
+                  }
+                },
+                "reduction": {
+                  "Reduce": []
+                }
+              }
+            }
+          }
+        },
+        {
+          "guarantee": {
+            "provenance": [
+              {
+                "kind": "exact",
+                "reason": "exact accumulator over exact input"
+              }
+            ],
+            "spec": {
+              "accuracy_metric": "absolute",
+              "accuracy_scope": "per_value",
+              "error": {
+                "op": "zero"
+              },
+              "failure_probability": {
+                "op": "zero"
+              }
+            }
+          },
+          "id": 5,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "float64"
+                },
+                "name": "sum",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": null,
+            "unique_keys": []
+          },
+          "output_state": {
+            "primitive": "Raw",
+            "timing": "query_time"
+          },
+          "payload": {
+            "ASAP": {
+              "FinalizeExactAccumulator": {
+                "child": 4
+              }
+            }
+          }
+        }
+      ],
+      "roots": [
+        5
+      ],
+      "scalar_roots": []
+    },
+    "display_name": "Q1 Sum acc + Rate acc ×5 panes · ingestion time: Rate acc for Q1, 5 × 1m panes"
+  }
+}
diff --git a/crates/devtools/tests/corpus_snapshots/o11y_bench/q25.json b/crates/devtools/tests/corpus_snapshots/o11y_bench/q25.json
new file mode 100644
index 000000000..5cf02606f
--- /dev/null
+++ b/crates/devtools/tests/corpus_snapshots/o11y_bench/q25.json
@@ -0,0 +1,6379 @@
+{
+  "accuracy_guarantees": "enforced",
+  "materialized_views": [
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+          "payload": {
+            "NonASAP": {
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+                  "checked_relative_division": false,
+                  "kind": {
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+              }
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+    },
+    "display_name": "Q1 Sum acc + Rate acc ×60 panes · ingestion time: Rate acc for Q1, 60 × 1m panes, Rate acc for Q1, 60 × 1m panes"
+  }
+}
diff --git a/crates/devtools/tests/corpus_snapshots/o11y_bench/q26.json b/crates/devtools/tests/corpus_snapshots/o11y_bench/q26.json
new file mode 100644
index 000000000..44b9907e5
--- /dev/null
+++ b/crates/devtools/tests/corpus_snapshots/o11y_bench/q26.json
@@ -0,0 +1,3027 @@
+{
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+                    "Column": "SampleValue"
+                  },
+                  "weight_domain": {
+                    "kind": "unknown_or_signed"
+                  }
+                },
+                "reduction": {
+                  "Reduce": []
+                }
+              }
+            }
+          }
+        },
+        {
+          "guarantee": {
+            "provenance": [
+              {
+                "kind": "exact",
+                "reason": "exact accumulator over exact input"
+              }
+            ],
+            "spec": {
+              "accuracy_metric": "absolute",
+              "accuracy_scope": "per_value",
+              "error": {
+                "op": "zero"
+              },
+              "failure_probability": {
+                "op": "zero"
+              }
+            }
+          },
+          "id": 5,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "float64"
+                },
+                "name": "sum",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": null,
+            "unique_keys": []
+          },
+          "output_state": {
+            "primitive": "Raw",
+            "timing": "query_time"
+          },
+          "payload": {
+            "ASAP": {
+              "FinalizeExactAccumulator": {
+                "child": 4
+              }
+            }
+          }
+        }
+      ],
+      "roots": [
+        5
+      ],
+      "scalar_roots": []
+    },
+    "display_name": "Q1 Sum acc + Rate acc ×60 panes · ingestion time: Rate acc for Q1, 60 × 1m panes"
+  }
+}
diff --git a/crates/devtools/tests/corpus_snapshots/o11y_bench/q27.json b/crates/devtools/tests/corpus_snapshots/o11y_bench/q27.json
new file mode 100644
index 000000000..5a891d56f
--- /dev/null
+++ b/crates/devtools/tests/corpus_snapshots/o11y_bench/q27.json
@@ -0,0 +1,497 @@
+{
+  "accuracy_guarantees": "enforced",
+  "materialized_views": [],
+  "pane_retention_ms": {},
+  "proven_optimal": true,
+  "query": "sum(up)",
+  "selected": {
+    "accepted": [
+      {
+        "accepted_metric": null,
+        "accepted_regardless_of_guarantee": false,
+        "guarantee_check_rejection": null,
+        "sketches": [],
+        "summary": "metric not set; accepted exact",
+        "target_metric": null
+      }
+    ],
+    "cost": {
+      "cost_per_second": 0.00630435009457,
+      "cost_unit": "cost_per_second",
+      "cpu_core_seconds_per_second": 6.30435e-6,
+      "per_node": {
+        "0": {
+          "cost_per_second": 0.00427000002522,
+          "cpu_core_seconds_per_second": 4.27e-6,
+          "detail": "scan 1000 samples; x 1.0167/s; keeps 32000 bytes of raw data on disk; holds 32 bytes for 0.0 ms",
+          "multiplier": 1,
+          "operator": "Scan",
+          "price_source": "analytical",
+          "timing": "query_time"
+        },
+        "1": {
+          "cost_per_second": 0.00101666669188,
+          "cpu_core_seconds_per_second": 1.01666666667e-6,
+          "detail": "time range 1s: keep 1000 of 1000 rows; x 1.0167/s; holds 32 bytes for 0.0 ms",
+          "multiplier": 1,
+          "operator": "TimeRange",
+          "price_source": "analytical",
+          "timing": "query_time"
+        },
+        "2": {
+          "cost_per_second": 0.0010166667108,
+          "cpu_core_seconds_per_second": 1.01666666667e-6,
+          "detail": "build exact Sum accumulator into 1 states: 1000 rows x depth 1; x 1.0167/s; holds 56 bytes for 0.0 ms",
+          "multiplier": 1,
+          "operator": "SummaryAgg",
+          "price_source": "analytical",
+          "timing": "query_time"
+        },
+        "3": {
+          "cost_per_second": 1.01666666667e-6,
+          "cpu_core_seconds_per_second": 1.01666666667e-9,
+          "detail": "finalize 1 accumulators; x 1.0167/s",
+          "multiplier": 1,
+          "operator": "FinalizeExactAccumulator",
+          "price_source": "analytical",
+          "timing": "query_time"
+        }
+      },
+      "source": "analytical-cost-v2 (illustrative statistics)",
+      "usage": {
+        "average_memory_bytes": 0.000756522,
+        "cpu_ops_per_second": 3051.01666667,
+        "disk_bytes": 32000,
+        "latency_per_query": [
+          {
+            "compaction_ms": 0.0,
+            "query_ms": 0.006201
+          }
+        ],
+        "peak_cpu_cores": 1,
+        "peak_memory_bytes": 120,
+        "scanned_bytes_per_second": 32533.3333333
+      }
+    },
+    "dag": {
+      "edges": [
+        {
+          "consumer": 1,
+          "data_state": {
+            "primitive": "Raw",
+            "timing": "query_time"
+          },
+          "grouping": "NotApplicable",
+          "intermediate_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "timestamp"
+                },
+                "name": "ts",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "float64"
+                },
+                "name": "value",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "$promql_series_identity",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": 0,
+            "unique_keys": [
+              [
+                2,
+                0
+              ]
+            ]
+          },
+          "producer": 0,
+          "role": "Input",
+          "window": "NotApplicable"
+        },
+        {
+          "consumer": 2,
+          "data_state": {
+            "primitive": "Raw",
+            "timing": "query_time"
+          },
+          "grouping": "NotApplicable",
+          "intermediate_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "timestamp"
+                },
+                "name": "ts",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "float64"
+                },
+                "name": "value",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "$promql_series_identity",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": 0,
+            "unique_keys": [
+              [
+                2,
+                0
+              ]
+            ]
+          },
+          "producer": 1,
+          "role": "Input",
+          "window": "NotApplicable"
+        },
+        {
+          "consumer": 3,
+          "data_state": {
+            "primitive": "SummaryState",
+            "timing": "query_time"
+          },
+          "grouping": "NotApplicable",
+          "intermediate_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "ExactAggregate": [
+                    "Sum",
+                    "Sum"
+                  ]
+                },
+                "name": "state",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": null,
+            "unique_keys": []
+          },
+          "producer": 2,
+          "role": "Input",
+          "window": "NotApplicable"
+        }
+      ],
+      "nodes": [
+        {
+          "guarantee": {
+            "provenance": [
+              {
+                "kind": "exact",
+                "reason": "exact over exact inputs"
+              }
+            ],
+            "spec": {
+              "accuracy_metric": "absolute",
+              "accuracy_scope": "per_value",
+              "error": {
+                "op": "zero"
+              },
+              "failure_probability": {
+                "op": "zero"
+              }
+            }
+          },
+          "id": 0,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "timestamp"
+                },
+                "name": "ts",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "float64"
+                },
+                "name": "value",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "$promql_series_identity",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": 0,
+            "unique_keys": [
+              [
+                2,
+                0
+              ]
+            ]
+          },
+          "output_state": {
+            "primitive": "Raw",
+            "timing": "query_time"
+          },
+          "payload": {
+            "NonASAP": {
+              "Scan": {
+                "predicates": [],
+                "schema": {
+                  "closed": true,
+                  "fields": [
+                    {
+                      "dtype": {
+                        "Plain": "timestamp"
+                      },
+                      "name": "ts",
+                      "nullable": false,
+                      "table": null
+                    },
+                    {
+                      "dtype": {
+                        "Plain": "float64"
+                      },
+                      "name": "value",
+                      "nullable": false,
+                      "table": null
+                    },
+                    {
+                      "dtype": {
+                        "Plain": "utf8"
+                      },
+                      "name": "$promql_series_identity",
+                      "nullable": false,
+                      "table": null
+                    }
+                  ],
+                  "time_index": 0,
+                  "unique_keys": [
+                    [
+                      2,
+                      0
+                    ]
+                  ]
+                },
+                "source": {
+                  "TimeSeries": {
+                    "metric": "up"
+                  }
+                }
+              }
+            }
+          }
+        },
+        {
+          "guarantee": {
+            "provenance": [
+              {
+                "kind": "exact",
+                "reason": "exact over exact inputs"
+              }
+            ],
+            "spec": {
+              "accuracy_metric": "absolute",
+              "accuracy_scope": "per_value",
+              "error": {
+                "op": "zero"
+              },
+              "failure_probability": {
+                "op": "zero"
+              }
+            }
+          },
+          "id": 1,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "timestamp"
+                },
+                "name": "ts",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "float64"
+                },
+                "name": "value",
+                "nullable": false,
+                "table": null
+              },
+              {
+                "dtype": {
+                  "Plain": "utf8"
+                },
+                "name": "$promql_series_identity",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": 0,
+            "unique_keys": [
+              [
+                2,
+                0
+              ]
+            ]
+          },
+          "output_state": {
+            "primitive": "Raw",
+            "timing": "query_time"
+          },
+          "payload": {
+            "NonASAP": {
+              "TimeRange": {
+                "child": 0,
+                "kind": "instant",
+                "range": {
+                  "nanos": 0,
+                  "secs": 1
+                }
+              }
+            }
+          }
+        },
+        {
+          "guarantee": null,
+          "id": 2,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "ExactAggregate": [
+                    "Sum",
+                    "Sum"
+                  ]
+                },
+                "name": "state",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": null,
+            "unique_keys": []
+          },
+          "output_state": {
+            "primitive": "SummaryState",
+            "timing": "query_time"
+          },
+          "payload": {
+            "ASAP": {
+              "SummaryAgg": {
+                "child": 1,
+                "family": {
+                  "ExactAggregate": [
+                    "Sum",
+                    "Sum"
+                  ]
+                },
+                "filter": null,
+                "grouping": "PerSubpopulationInstance",
+                "input": {
+                  "item": null,
+                  "weight": {
+                    "Column": "SampleValue"
+                  },
+                  "weight_domain": {
+                    "kind": "unknown_or_signed"
+                  }
+                },
+                "reduction": {
+                  "Reduce": []
+                }
+              }
+            }
+          }
+        },
+        {
+          "guarantee": {
+            "provenance": [
+              {
+                "kind": "exact",
+                "reason": "exact accumulator over exact input"
+              }
+            ],
+            "spec": {
+              "accuracy_metric": "absolute",
+              "accuracy_scope": "per_value",
+              "error": {
+                "op": "zero"
+              },
+              "failure_probability": {
+                "op": "zero"
+              }
+            }
+          },
+          "id": 3,
+          "materialization": "NotMaterialized",
+          "output_schema": {
+            "closed": true,
+            "fields": [
+              {
+                "dtype": {
+                  "Plain": "float64"
+                },
+                "name": "sum",
+                "nullable": false,
+                "table": null
+              }
+            ],
+            "time_index": null,
+            "unique_keys": []
+          },
+          "output_state": {
+            "primitive": "Raw",
+            "timing": "query_time"
+          },
+          "payload": {
+            "ASAP": {
+              "FinalizeExactAccumulator": {
+                "child": 2
+              }
+            }
+          }
+        }
+      ],
+      "roots": [
+        3
+      ],
+      "scalar_roots": []
+    },
+    "display_name": "Q1 Sum acc"
+  }
+}
diff --git a/docs/develop_docs/README.md b/docs/develop_docs/README.md
index ec6907a21..ce3e42161 100644
--- a/docs/develop_docs/README.md
+++ b/docs/develop_docs/README.md
@@ -13,6 +13,7 @@ formats, evidence, and verification workflows.
 - [Offline sketch evidence](offline-sketch-evidence.md)
 - [Metrics-observability corpora](metrics-observability-corpora.md)
 - [Physical compile coverage for deployment computation](physical-compile-coverage.md)
+- [Planner snapshots](planner-snapshots.md)
 
 Historical records of removed APIs:
 
diff --git a/docs/develop_docs/planner-snapshots.md b/docs/develop_docs/planner-snapshots.md
new file mode 100644
index 000000000..2a690ed1b
--- /dev/null
+++ b/docs/develop_docs/planner-snapshots.md
@@ -0,0 +1,69 @@
+# Planner snapshots
+
+The planner has no reference answer to test against, so CI pins what it
+produces. For each query in a corpus, the plan that `stage_pipeline` selects
+(default search) is committed as a snapshot. A PR that changes any of these
+plans fails the `corpus-snapshots` CI job until the snapshots are regenerated
+and the change is explained.
+
+## Layout
+
+`crates/devtools/tests/corpus_snapshots/<corpus>/`:
+
+- `corpus.json`: the inputs shared by the corpus's queries (`stage_pipeline_args`,
+  the repeating-query entry and the `data_workload`), and the queries, each
+  with a stable `id`. Each query is planned on its own. A query with a
+  `skip_reason` entry (saying why) is skipped and has no snapshot.
+- `<id>.json`: that query's snapshot, pretty-printed with sorted keys.
+
+## What a snapshot holds
+
+Only the plan, which must not change between runs:
+
+- `query` and `accuracy_guarantees`;
+- `selected`: the selected Stage 2 candidate's `display_name` and `dag`, its
+  `cost` (`cost_per_second`, `usage`, `per_node`) and `accepted` accuracy;
+- `proven_optimal`: whether the search proved the plan optimal (its status is
+  `optimal`) rather than stopping at an evaluation budget;
+- `materialized_views`, `pane_retention_ms` and any `warnings`;
+- for a query that does not plan, `selected: null`, the `error` up to its
+  embedded search report, and the causes and reasons of the rejections.
+
+Floats are rounded to 12 significant digits. Everything about the search
+except whether it proved the plan optimal is left out: candidate ids (such as
+`pane-round-12-joint-plan-1`), the search report's counters, bounds and timings, the Stage 1 and Stage 2
+candidate lists, and the memo (`stage_pipeline` runs with `--no-memo`). These
+vary from run to run because the search's pane-width rounds have wall-clock
+budgets, so a different round can find the same plan.
+
+## When the check fails
+
+The test names each changed query and its first differing line. CI uploads
+the regenerated snapshots, with each one's full `stage_pipeline` document
+(`<id>.document.json`, which [`tools/dag-viewer`](../../tools/dag-viewer/README.md)
+opens), as the `corpus-snapshots` artifact.
+
+If the change is intended, regenerate the snapshots and commit them:
+
+```sh
+UPDATE_SNAPSHOTS=1 cargo test --release -p asap-devtools --test corpus_snapshots -- --ignored
+```
+
+Then list each changed query and why it changed under **Snapshot changes** in
+the PR description.
+
+The test also fails, instead of recording a snapshot, in these cases:
+
+- A query's search was ended by a wall-clock budget: its status is
+  `time_limit`, or planning used the whole 240 s limit. Its plan would then
+  depend on machine speed. Only the final pane round's status is checked: an
+  earlier round cut short by its own wall-clock budget is not reported.
+- A snapshot file has no matching checked query in `corpus.json`.
+- `stage_pipeline` crashed.
+
+## Adding queries
+
+Add the query to `corpus.json` with a new `id` and regenerate. Before you
+commit, run the check twice, plus once on one core (`taskset -c 0`), and confirm
+it passes each time. Keep each query well under the 240 s limit on one core
+with a release build; otherwise give it a `skip_reason`.