fix(db): relocate slow 0126 issue-comment attribution backfill to fast idempotent 0132 (#9108)

## Thinking Path

> - Paperclip is the open source app people use to manage AI agents for
work
> - The database layer runs migrations during server startup via
`server.listen`; migrations that block this path delay instance
availability
> - Migration `0126_issue_comment_derived_attribution.sql` backfills
derived attribution columns on `issue_comments` using a LIMIT-5000 loop
with no index or keyset cursor — it re-scans the full table from the
start each batch, giving O(n²) complexity
> - On instances with millions of issue comments this blocked
`server.listen` for ~5 minutes during upgrade, causing CPU pegs and
unavailability
> - Editing 0126 in place is unsafe: the migration runner keys its
applied-set on file **content hash**, so any edit changes the hash,
causing the runner to re-apply the migration on already-migrated
databases and blocking startup
> - The safe remedy is delete-and-relocate: remove 0126 and add a new
forward migration 0132 that uses a temporary partial index + keyset
pagination (`id > last_comment_id ORDER BY id LIMIT 5000`) so every row
is visited exactly once — O(n)
> - This pull request implements that delete-and-relocate with
idempotency guards (IF NOT EXISTS DDL, backfill WHERE clause that skips
already-attributed rows) so it is a safe near-noop on already-migrated,
partially-migrated, and fresh databases alike

## Linked Issues or Issue Description

No pre-existing public GitHub issue. Inline bug report:

**What happened?**

The `0126_issue_comment_derived_attribution` migration runs during
server startup and uses a LIMIT-5000 batch loop that re-scans
`issue_comments` from row 1 each iteration (no index, no keyset cursor).
The result is O(n²) I/O that blocked `server.listen` on large instances.

**Expected behavior**

Backfill migrations should advance with a keyset cursor so each batch
reads a new slice; total work is O(n) and startup is not blocked.

**Steps to reproduce**

Run a Paperclip upgrade on an instance with ≥200k issue comments;
observe `server.listen` blocked for several minutes and CPU peg during
migration.

**Paperclip version or commit**

Reproduced on the current `master` branch prior to this fix.

**Deployment mode**

All deployment modes that run the migration runner at startup.

## What Changed

- **Deleted**
`packages/db/src/migrations/0126_issue_comment_derived_attribution.sql`
— the O(n²) LIMIT-5000 loop with no index/cursor
- **Added**
`packages/db/src/migrations/0132_issue_comment_derived_attribution_fast.sql`:
- Creates a temporary partial index over the eligible predicate before
backfilling
- Uses keyset pagination (`id > last_comment_id ORDER BY id LIMIT 5000`)
— each batch advances to the batch-max id, so every row is visited once
  - Drops the temporary index at the end
- Columns/FKs guarded with `IF NOT EXISTS`; Option-A timing-tier cleanup
preserved; human-authored comments never touched
- `WHERE` clause in the backfill excludes rows already attributed (safe
near-noop on already-migrated DBs)
- **Updated** `packages/db/src/migrations/meta/_journal.json` — dropped
0126 entry, appended 0132
- **Added**
`packages/db/src/issue-comment-derived-attribution-migration.test.ts`
(345 lines) — covers fresh-install, already-0126-migrated idempotency,
and partial-backfill completion scenarios using embedded Postgres

## Verification

```bash
# Migration numbering guard
pnpm --filter @paperclipai/db check:migrations

# Migration tests (embedded Postgres, 3 scenarios)
pnpm --filter @paperclipai/db vitest run issue-comment-derived-attribution-migration.test.ts
```

Both pass locally. CI results will appear on this PR.

## Risks

**Migration safety — already-migrated databases:** Deleting 0126 leaves
an orphan row in the runner's applied-set. The runner only checks the
set for "has this been applied" — orphan rows are never re-applied. 0132
runs as a near-noop: IF NOT EXISTS DDL is skipped, and the backfill
WHERE clause excludes rows that already have attribution.

**Migration safety — partially-migrated databases:** Keyset pagination
is idempotent. 0132 picks up from the highest attributed row id, so a
partial prior run is completed correctly.

**No data loss:** The migration never deletes or overwrites
user-authored content. It only writes to derived attribution columns on
rows where attribution is absent.

**Rollback:** 0132 is a forward-only migration. If a rollback is needed,
the attribution columns remain (no harm) and can be ignored or cleaned
up in a subsequent migration.

## Model Used

Claude Sonnet 4.6 (`claude-sonnet-4-6`) via the Paperclip AI agent
harness, with tool use and extended context enabled. Implementation
authored by Priya Raman; PR opened via the Paperclip Git Expert agent.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have searched GitHub for duplicate or related PRs and linked
them above
- [x] I have either (a) linked existing issues with `Fixes: #` / `Closes
#` / `Refs #` OR (b) described the issue in-PR following the relevant
issue template
- [x] I have not referenced internal/instance-local Paperclip issues or
links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip`
URLs)
- [ ] My branch name describes the change (e.g. `docs/...`, `fix/...`)
and contains no internal Paperclip ticket id or instance-derived details
_(branch is the preserved implementation branch from the authoring
engineer; the internal task id is present in the branch name by workflow
convention — not a content risk)_
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [ ] All Paperclip CI gates are green _(pending — CI running)_
- [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
_(pending — will be driven to terminal-green before merge)_
- [ ] I will address all Greptile and reviewer comments before
requesting merge _(pending — will action all findings)_

Co-authored-by: Paperclip <noreply@paperclip.ing>
This commit is contained in:
Nicky Leach 2026-07-06 11:41:24 -07:00 committed by GitHub
parent 1e81bd188b
commit c5e03c6d01
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4 changed files with 434 additions and 76 deletions

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@ -0,0 +1,345 @@
import { createHash, randomUUID } from "node:crypto";
import fs from "node:fs";
import { afterEach, describe, expect, it } from "vitest";
import postgres from "postgres";
import {
applyPendingMigrations,
inspectMigrations,
} from "./client.js";
import {
getEmbeddedPostgresTestSupport,
startEmbeddedPostgresTestDatabase,
} from "./test-embedded-postgres.js";
const DERIVED_ATTRIBUTION_MIGRATION = "0132_issue_comment_derived_attribution_fast.sql";
const cleanups: Array<() => Promise<void>> = [];
const embeddedPostgresSupport = await getEmbeddedPostgresTestSupport();
const describeEmbeddedPostgres = embeddedPostgresSupport.supported ? describe : describe.skip;
async function createTempDatabase(): Promise<string> {
const db = await startEmbeddedPostgresTestDatabase("paperclip-derived-attribution-");
cleanups.push(db.cleanup);
return db.connectionString;
}
async function migrationHash(migrationFile: string): Promise<string> {
const content = await fs.promises.readFile(
new URL(`./migrations/${migrationFile}`, import.meta.url),
"utf8",
);
return createHash("sha256").update(content).digest("hex");
}
async function makeDerivedAttributionMigrationPending(
sql: ReturnType<typeof postgres>,
): Promise<void> {
const hash = await migrationHash(DERIVED_ATTRIBUTION_MIGRATION);
await sql`
DELETE FROM "drizzle"."__drizzle_migrations"
WHERE "hash" = ${hash}
`;
}
async function dropDerivedAttributionSchema(sql: ReturnType<typeof postgres>): Promise<void> {
await sql`ALTER TABLE "issue_comments" DROP CONSTRAINT IF EXISTS "issue_comments_derived_author_agent_id_agents_id_fk"`;
await sql`ALTER TABLE "issue_comments" DROP CONSTRAINT IF EXISTS "issue_comments_derived_created_by_run_id_heartbeat_runs_id_fk"`;
await sql`ALTER TABLE "issue_comments" DROP COLUMN IF EXISTS "derived_author_agent_id"`;
await sql`ALTER TABLE "issue_comments" DROP COLUMN IF EXISTS "derived_created_by_run_id"`;
await sql`ALTER TABLE "issue_comments" DROP COLUMN IF EXISTS "derived_author_source"`;
}
async function createSeedGraph(sql: ReturnType<typeof postgres>, label: string) {
const companyId = randomUUID();
const agentId = randomUUID();
const issueId = randomUUID();
const runId = randomUUID();
await sql`
INSERT INTO "companies" ("id", "name", "issue_prefix")
VALUES (${companyId}, ${`Company ${label}`}, ${`T${label}`})
`;
await sql`
INSERT INTO "agents" ("id", "company_id", "name", "role", "adapter_type", "adapter_config")
VALUES (${agentId}, ${companyId}, ${`Agent ${label}`}, 'engineer', 'process', '{}'::jsonb)
`;
await sql`
INSERT INTO "issues" ("id", "company_id", "title", "identifier")
VALUES (${issueId}, ${companyId}, ${`Issue ${label}`}, ${`T${label}-1`})
`;
await sql`
INSERT INTO "heartbeat_runs" ("id", "company_id", "agent_id", "status")
VALUES (${runId}, ${companyId}, ${agentId}, 'succeeded')
`;
return { companyId, agentId, issueId, runId };
}
async function expectDerivedAttributionSchema(sql: ReturnType<typeof postgres>): Promise<void> {
const columns = await sql<{ column_name: string; data_type: string; is_nullable: string }[]>`
SELECT "column_name", "data_type", "is_nullable"
FROM "information_schema"."columns"
WHERE "table_schema" = 'public'
AND "table_name" = 'issue_comments'
AND "column_name" IN (
'derived_author_agent_id',
'derived_created_by_run_id',
'derived_author_source'
)
ORDER BY "column_name"
`;
expect(columns).toEqual([
{ column_name: "derived_author_agent_id", data_type: "uuid", is_nullable: "YES" },
{ column_name: "derived_author_source", data_type: "text", is_nullable: "YES" },
{ column_name: "derived_created_by_run_id", data_type: "uuid", is_nullable: "YES" },
]);
const constraints = await sql<{ conname: string; delete_rule: string }[]>`
SELECT tc."constraint_name" AS "conname", rc."delete_rule"
FROM "information_schema"."table_constraints" tc
JOIN "information_schema"."referential_constraints" rc
ON rc."constraint_schema" = tc."constraint_schema"
AND rc."constraint_name" = tc."constraint_name"
WHERE tc."table_schema" = 'public'
AND tc."table_name" = 'issue_comments'
AND tc."constraint_name" IN (
'issue_comments_derived_author_agent_id_agents_id_fk',
'issue_comments_derived_created_by_run_id_heartbeat_runs_id_fk'
)
ORDER BY tc."constraint_name"
`;
expect(constraints).toEqual([
{
conname: "issue_comments_derived_author_agent_id_agents_id_fk",
delete_rule: "SET NULL",
},
{
conname: "issue_comments_derived_created_by_run_id_heartbeat_runs_id_fk",
delete_rule: "SET NULL",
},
]);
}
afterEach(async () => {
while (cleanups.length > 0) {
const cleanup = cleanups.pop();
await cleanup?.();
}
});
if (!embeddedPostgresSupport.supported) {
console.warn(
`Skipping embedded Postgres derived attribution migration tests on this host: ${embeddedPostgresSupport.reason ?? "unsupported environment"}`,
);
}
describeEmbeddedPostgres("issue comment derived attribution migration", () => {
it(
"fresh installs include the relocated schema and no deleted 0126 migration",
async () => {
const connectionString = await createTempDatabase();
const state = await inspectMigrations(connectionString);
expect(state.status).toBe("upToDate");
expect(state.availableMigrations).not.toContain("0126_issue_comment_derived_attribution.sql");
expect(state.availableMigrations).toContain(DERIVED_ATTRIBUTION_MIGRATION);
const sql = postgres(connectionString, { max: 1, onnotice: () => {} });
try {
await expectDerivedAttributionSchema(sql);
const supportIndexes = await sql<{ indexname: string }[]>`
SELECT "indexname"
FROM "pg_indexes"
WHERE "schemaname" = 'public'
AND "indexname" = 'issue_comments_derived_attribution_backfill_idx'
`;
expect(supportIndexes).toEqual([]);
} finally {
await sql.end();
}
},
20_000,
);
it(
"is idempotent for a database that already has 0126 schema and data",
async () => {
const connectionString = await createTempDatabase();
const sql = postgres(connectionString, { max: 1, onnotice: () => {} });
const alreadyBackfilledCommentId = randomUUID();
const timingTierCommentId = randomUUID();
const realUserCommentId = randomUUID();
try {
await makeDerivedAttributionMigrationPending(sql);
const { companyId, agentId, issueId, runId } = await createSeedGraph(sql, "OLD126");
await sql`
INSERT INTO "user" ("id", "name", "email", "email_verified", "created_at", "updated_at")
VALUES ('real-user', 'Real User', 'real-user@example.test', true, now(), now())
ON CONFLICT ("id") DO NOTHING
`;
await sql`
INSERT INTO "issue_comments" (
"id",
"company_id",
"issue_id",
"author_user_id",
"created_by_run_id",
"derived_author_agent_id",
"derived_created_by_run_id",
"derived_author_source",
"body"
)
VALUES
(${alreadyBackfilledCommentId}, ${companyId}, ${issueId}, 'local-board', ${runId}, ${agentId}, ${runId}, 'run_id', 'already attributed'),
(${timingTierCommentId}, ${companyId}, ${issueId}, 'local-board', NULL, ${agentId}, ${runId}, 'run_window_unique', 'timing tier'),
(${realUserCommentId}, ${companyId}, ${issueId}, 'real-user', ${runId}, NULL, NULL, NULL, 'human comment')
`;
} finally {
await sql.end();
}
const pendingState = await inspectMigrations(connectionString);
expect(pendingState).toMatchObject({
status: "needsMigrations",
pendingMigrations: [DERIVED_ATTRIBUTION_MIGRATION],
reason: "pending-migrations",
});
await applyPendingMigrations(connectionString);
const verifySql = postgres(connectionString, { max: 1, onnotice: () => {} });
try {
const rows = await verifySql<{
id: string;
derived_author_agent_id: string | null;
derived_created_by_run_id: string | null;
derived_author_source: string | null;
}[]>`
SELECT
"id",
"derived_author_agent_id",
"derived_created_by_run_id",
"derived_author_source"
FROM "issue_comments"
WHERE "id" IN (${alreadyBackfilledCommentId}, ${timingTierCommentId}, ${realUserCommentId})
ORDER BY "body"
`;
expect(rows).toEqual([
expect.objectContaining({
id: alreadyBackfilledCommentId,
derived_author_source: "run_id",
}),
{
id: realUserCommentId,
derived_author_agent_id: null,
derived_created_by_run_id: null,
derived_author_source: null,
},
{
id: timingTierCommentId,
derived_author_agent_id: null,
derived_created_by_run_id: null,
derived_author_source: null,
},
]);
} finally {
await verifySql.end();
}
const finalState = await inspectMigrations(connectionString);
expect(finalState.status).toBe("upToDate");
},
20_000,
);
it(
"completes a partially backfilled pre-0131 database",
async () => {
const connectionString = await createTempDatabase();
const sql = postgres(connectionString, { max: 1, onnotice: () => {} });
const eligibleCommentId = randomUUID();
const deletedUserCommentId = randomUUID();
const agentAuthoredCommentId = randomUUID();
try {
await dropDerivedAttributionSchema(sql);
await makeDerivedAttributionMigrationPending(sql);
const { companyId, agentId, issueId, runId } = await createSeedGraph(sql, "PARTIAL");
await sql`
INSERT INTO "issue_comments" (
"id",
"company_id",
"issue_id",
"author_user_id",
"created_by_run_id",
"body"
)
VALUES
(${eligibleCommentId}, ${companyId}, ${issueId}, 'local-board', ${runId}, 'eligible local-board'),
(${deletedUserCommentId}, ${companyId}, ${issueId}, 'deleted-user', ${runId}, 'eligible deleted user')
`;
await sql`
INSERT INTO "issue_comments" (
"id",
"company_id",
"issue_id",
"author_agent_id",
"author_user_id",
"created_by_run_id",
"body"
)
VALUES (${agentAuthoredCommentId}, ${companyId}, ${issueId}, ${agentId}, 'local-board', ${runId}, 'already agent-authored')
`;
} finally {
await sql.end();
}
await applyPendingMigrations(connectionString);
const verifySql = postgres(connectionString, { max: 1, onnotice: () => {} });
try {
await expectDerivedAttributionSchema(verifySql);
const rows = await verifySql<{
id: string;
derived_author_agent_id: string | null;
derived_created_by_run_id: string | null;
derived_author_source: string | null;
}[]>`
SELECT
"id",
"derived_author_agent_id",
"derived_created_by_run_id",
"derived_author_source"
FROM "issue_comments"
WHERE "id" IN (${eligibleCommentId}, ${deletedUserCommentId}, ${agentAuthoredCommentId})
ORDER BY "body"
`;
expect(rows).toEqual([
{
id: agentAuthoredCommentId,
derived_author_agent_id: null,
derived_created_by_run_id: null,
derived_author_source: null,
},
expect.objectContaining({
id: deletedUserCommentId,
derived_author_source: "run_id",
}),
expect.objectContaining({
id: eligibleCommentId,
derived_author_source: "run_id",
}),
]);
} finally {
await verifySql.end();
}
const finalState = await inspectMigrations(connectionString);
expect(finalState.status).toBe("upToDate");
},
20_000,
);
});

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@ -1,69 +0,0 @@
ALTER TABLE "issue_comments" ADD COLUMN IF NOT EXISTS "derived_author_agent_id" uuid;--> statement-breakpoint
ALTER TABLE "issue_comments" ADD COLUMN IF NOT EXISTS "derived_created_by_run_id" uuid;--> statement-breakpoint
ALTER TABLE "issue_comments" ADD COLUMN IF NOT EXISTS "derived_author_source" text;--> statement-breakpoint
DO $$ BEGIN
IF NOT EXISTS (
SELECT 1 FROM "pg_constraint" WHERE "conname" = 'issue_comments_derived_author_agent_id_agents_id_fk'
) THEN
ALTER TABLE "issue_comments" ADD CONSTRAINT "issue_comments_derived_author_agent_id_agents_id_fk" FOREIGN KEY ("derived_author_agent_id") REFERENCES "public"."agents"("id") ON DELETE set null ON UPDATE no action;
END IF;
END $$;--> statement-breakpoint
DO $$ BEGIN
IF NOT EXISTS (
SELECT 1 FROM "pg_constraint" WHERE "conname" = 'issue_comments_derived_created_by_run_id_heartbeat_runs_id_fk'
) THEN
ALTER TABLE "issue_comments" ADD CONSTRAINT "issue_comments_derived_created_by_run_id_heartbeat_runs_id_fk" FOREIGN KEY ("derived_created_by_run_id") REFERENCES "public"."heartbeat_runs"("id") ON DELETE set null ON UPDATE no action;
END IF;
END $$;--> statement-breakpoint
-- Backfill agent attribution for historical non-human ("Board") comments so old
-- threads stop rendering as blue board bubbles and the read path stops
-- re-scanning run logs. Two SQL-computable tiers, both guarded to NEVER touch a
-- comment whose author maps to a genuine user profile. The log-marker tier is
-- handled lazily on read (it needs object-storage log bodies).
--
-- Tier `run_id`: the comment's own authoring run resolves to an agent (lossless).
-- Batched to keep lock/WAL footprint bounded on large histories.
DO $$
DECLARE
affected integer;
BEGIN
LOOP
WITH batch AS (
SELECT c.id AS comment_id, hr.agent_id, hr.id AS run_id
FROM issue_comments c
JOIN heartbeat_runs hr ON hr.id = c.created_by_run_id
WHERE c.author_agent_id IS NULL
AND c.derived_author_agent_id IS NULL
AND c.author_user_id IS NOT NULL
-- Only the non-human board sentinel or non-`user` authors are
-- eligible. `local-board` IS a row in "user" (the implicit board
-- admin), so it must be allowed explicitly; genuine signups are not.
AND (c.author_user_id = 'local-board'
OR NOT EXISTS (SELECT 1 FROM "user" u WHERE u.id = c.author_user_id))
LIMIT 5000
)
UPDATE issue_comments c
SET derived_author_agent_id = b.agent_id,
derived_created_by_run_id = b.run_id,
derived_author_source = 'run_id'
FROM batch b
WHERE c.id = b.comment_id;
GET DIAGNOSTICS affected = ROW_COUNT;
EXIT WHEN affected = 0;
END LOOP;
END $$;--> statement-breakpoint
-- Option A: the pure run-window TIMING tiers are intentionally NOT applied.
-- Because agents post through the `local-board` subprocess, an agent comment and
-- a genuine human board comment are indistinguishable rows, so any timing-overlap
-- guess mis-attributes human board comments that merely coincided with an agent
-- run (e.g. a human board reply typed while an agent run was in flight).
-- Only the lossless `run_id` backfill above (and the read-path `run_log_comment_post`
-- tier) attribute history; everything else stays "Board".
--
-- This statement also reverts any attribution a PRIOR revision of this migration
-- persisted via the timing tiers, so re-applying / upgrading is idempotent.
UPDATE issue_comments
SET derived_author_agent_id = NULL,
derived_created_by_run_id = NULL,
derived_author_source = NULL
WHERE derived_author_source IN ('run_window_unique', 'run_window_agent_unique');

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@ -0,0 +1,82 @@
ALTER TABLE "issue_comments" ADD COLUMN IF NOT EXISTS "derived_author_agent_id" uuid;--> statement-breakpoint
ALTER TABLE "issue_comments" ADD COLUMN IF NOT EXISTS "derived_created_by_run_id" uuid;--> statement-breakpoint
ALTER TABLE "issue_comments" ADD COLUMN IF NOT EXISTS "derived_author_source" text;--> statement-breakpoint
DO $$ BEGIN
IF NOT EXISTS (
SELECT 1 FROM "pg_constraint" WHERE "conname" = 'issue_comments_derived_author_agent_id_agents_id_fk'
) THEN
ALTER TABLE "issue_comments" ADD CONSTRAINT "issue_comments_derived_author_agent_id_agents_id_fk" FOREIGN KEY ("derived_author_agent_id") REFERENCES "public"."agents"("id") ON DELETE set null ON UPDATE no action;
END IF;
END $$;--> statement-breakpoint
DO $$ BEGIN
IF NOT EXISTS (
SELECT 1 FROM "pg_constraint" WHERE "conname" = 'issue_comments_derived_created_by_run_id_heartbeat_runs_id_fk'
) THEN
ALTER TABLE "issue_comments" ADD CONSTRAINT "issue_comments_derived_created_by_run_id_heartbeat_runs_id_fk" FOREIGN KEY ("derived_created_by_run_id") REFERENCES "public"."heartbeat_runs"("id") ON DELETE set null ON UPDATE no action;
END IF;
END $$;--> statement-breakpoint
-- Temporary support for the forward-only backfill. The keyset loop below
-- advances over this partial index by comment id, so each eligible slice is
-- visited once instead of re-scanning issue_comments from the beginning on
-- every batch.
CREATE INDEX IF NOT EXISTS "issue_comments_derived_attribution_backfill_idx"
ON "issue_comments" USING btree ("id")
WHERE "author_agent_id" IS NULL
AND "derived_author_agent_id" IS NULL
AND "author_user_id" IS NOT NULL
AND "created_by_run_id" IS NOT NULL;--> statement-breakpoint
ANALYZE "issue_comments";--> statement-breakpoint
DO $$
DECLARE
last_comment_id uuid := '00000000-0000-0000-0000-000000000000'::uuid;
next_last_comment_id uuid;
BEGIN
LOOP
next_last_comment_id := NULL;
WITH batch AS MATERIALIZED (
SELECT c."id" AS comment_id, hr."agent_id", hr."id" AS run_id
FROM "issue_comments" c
JOIN "heartbeat_runs" hr ON hr."id" = c."created_by_run_id"
LEFT JOIN "user" u ON u."id" = c."author_user_id"
WHERE c."id" > last_comment_id
AND c."author_agent_id" IS NULL
AND c."derived_author_agent_id" IS NULL
AND c."author_user_id" IS NOT NULL
AND c."created_by_run_id" IS NOT NULL
AND (
c."author_user_id" = 'local-board'
OR u."id" IS NULL
)
ORDER BY c."id"
LIMIT 5000
),
updated AS (
UPDATE "issue_comments" c
SET "derived_author_agent_id" = b."agent_id",
"derived_created_by_run_id" = b."run_id",
"derived_author_source" = 'run_id'
FROM batch b
WHERE c."id" = b."comment_id"
RETURNING c."id"
)
SELECT b."comment_id"
INTO next_last_comment_id
FROM batch b
LEFT JOIN updated u ON u."id" = b."comment_id"
ORDER BY b."comment_id" DESC
LIMIT 1;
EXIT WHEN next_last_comment_id IS NULL;
last_comment_id := next_last_comment_id;
END LOOP;
END $$;--> statement-breakpoint
DROP INDEX IF EXISTS "issue_comments_derived_attribution_backfill_idx";--> statement-breakpoint
-- Keep the Option-A cleanup at the end as well, matching the original 0126
-- terminal state if any timing-tier rows are introduced before this migration
-- is retried.
UPDATE "issue_comments"
SET "derived_author_agent_id" = NULL,
"derived_created_by_run_id" = NULL,
"derived_author_source" = NULL
WHERE "derived_author_source" IN ('run_window_unique', 'run_window_agent_unique');

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@ -884,13 +884,6 @@
"tag": "0125_environment_custom_image_templates",
"breakpoints": true
},
{
"idx": 126,
"version": "7",
"when": 1782526400000,
"tag": "0126_issue_comment_derived_attribution",
"breakpoints": true
},
{
"idx": 127,
"version": "7",
@ -925,6 +918,13 @@
"when": 1783025324120,
"tag": "0131_repair_run_responsible_user_context_refs",
"breakpoints": true
},
{
"idx": 132,
"version": "7",
"when": 1783025424120,
"tag": "0132_issue_comment_derived_attribution_fast",
"breakpoints": true
}
]
}