diff --git a/docs/arch/cron.md b/docs/arch/cron.md
index 9d638159..da41ad4a 100644
--- a/docs/arch/cron.md
+++ b/docs/arch/cron.md
@@ -2,7 +2,7 @@
 
 Generated from literal `defineScheduledTask` declarations. Run `pnpm cron:docs` after schedule changes.
 
-Tasks: 24. Unique Cloudflare triggers: 15.
+Tasks: 25. Unique Cloudflare triggers: 16.
 
 | Task | Cron | Source |
 | --- | --- | --- |
@@ -16,6 +16,7 @@ Tasks: 24. Unique Cloudflare triggers: 15.
 | `detect-star-surges` | `30 4 * * *` | `layers/registry/server/tasks/detect-star-surges.ts` |
 | `drain-skill-dirty` | `*/5 * * * *` | `layers/registry/server/tasks/drain-skill-dirty.ts` |
 | `embedding-parity-audit` | `0 21 * * *` | `layers/registry/server/tasks/embedding-parity-audit.ts` |
+| `prune-finished-jobs` | `40 * * * *` | `layers/registry/server/tasks/prune-finished-jobs.ts` |
 | `purge-personal-data` | `30 4 * * *` | `layers/identity/server/tasks/purge-personal-data.ts` |
 | `recompute-skill-scores` | `0 3 * * *` | `layers/registry/server/tasks/recompute-skill-scores.ts` |
 | `reconcile-rendered` | `20 */6 * * *` | `layers/registry/server/tasks/reconcile-rendered.ts` |
diff --git a/layers/registry/server/tasks/prune-finished-jobs.ts b/layers/registry/server/tasks/prune-finished-jobs.ts
new file mode 100644
index 00000000..b73f04f9
--- /dev/null
+++ b/layers/registry/server/tasks/prune-finished-jobs.ts
@@ -0,0 +1,55 @@
+/// <reference types="@cloudflare/workers-types" />
+
+import { resolveCloudflareBindings } from '@harlan-zw/nuxt-cloudflare/bindings'
+import { runObservedScheduledTask } from '~~/server/utils/scheduled-run'
+import { reportJobRun } from '~~/server/utils/sync-job-reporter'
+import { observedSchedulePolicy } from '#shared/schedule-policy'
+import { pruneFinishedJobs } from '../utils/finished-job-retention'
+
+const CRON = '40 * * * *'
+
+/**
+ * Scheduled task: delete finished durable job rows and old embedding attempts.
+ *
+ * nuxt-cf-jobs soft-completes a job, so every hourly sync left up to 250
+ * `jobs` rows behind, with their payloads and retry reasons, forever. D1 is a
+ * 10 GB store and reached that limit on 2026-11-04. Append-only history needs
+ * a retention window, and this task is the window for the job tables.
+ *
+ * The minute avoids the top of the hour, when the sync creates its batch.
+ */
+export default defineScheduledTask({
+  name: 'prune-finished-jobs',
+  cron: '40 * * * *',
+  description: 'Delete finished durable job rows and old embedding attempts',
+  async run({ context }) {
+    const env = resolveCloudflareBindings<Cloudflare.Env>(context)
+    const db = env?.DB as D1Database | undefined
+    if (!env || !db) {
+      emitOperationalEvent(createWideEvent({ operation: 'prune-finished-jobs', outcome: 'binding-missing' }))
+      return { result: { error: 'no-db' } }
+    }
+
+    return await runObservedScheduledTask({
+      db,
+      env,
+      context,
+      policy: observedSchedulePolicy('prune-finished-jobs'),
+    }, async () => {
+      const startedAt = Date.now()
+      const report = await pruneFinishedJobs(db, { now: Math.floor(startedAt / 1000) })
+      emitOperationalEvent(createWideEvent({
+        'operation': 'prune-finished-jobs',
+        'outcome': 'completed',
+        'success.count': report.completedJobs + report.failedJobs + report.finishedBatches + report.embeddingAttempts,
+        'truncated': report.truncated,
+      }))
+      await reportJobRun(db, 'prune-finished-jobs', {
+        cron: CRON,
+        status: 'ok',
+        durationMs: Date.now() - startedAt,
+      })
+      return { result: report }
+    })
+  },
+})
diff --git a/layers/registry/server/utils/finished-job-retention.spec.ts b/layers/registry/server/utils/finished-job-retention.spec.ts
new file mode 100644
index 00000000..0d78708c
--- /dev/null
+++ b/layers/registry/server/utils/finished-job-retention.spec.ts
@@ -0,0 +1,127 @@
+import Database from 'better-sqlite3'
+import { afterEach, beforeEach, describe, expect, it } from 'vitest'
+import {
+  COMPLETED_JOB_RETENTION_SECONDS,
+  EMBEDDING_ATTEMPT_RETENTION_SECONDS,
+  FAILED_JOB_RETENTION_SECONDS,
+  pruneFinishedJobs,
+} from './finished-job-retention'
+
+const DAY = 24 * 60 * 60
+const NOW = 1_800_000_000
+
+describe('pruneFinishedJobs', () => {
+  let sqlite: Database.Database
+
+  beforeEach(() => {
+    sqlite = new Database(':memory:')
+    sqlite.exec(`
+      CREATE TABLE job_batches (
+        id TEXT PRIMARY KEY,
+        parent_batch_id TEXT,
+        finished_at INTEGER
+      );
+      CREATE TABLE jobs (
+        id TEXT PRIMARY KEY,
+        batch_id TEXT REFERENCES job_batches(id),
+        payload TEXT NOT NULL DEFAULT '{}',
+        completed_at INTEGER,
+        failed_at INTEGER
+      );
+      CREATE TABLE failed_jobs (
+        id TEXT PRIMARY KEY,
+        batch_id TEXT,
+        failed_at INTEGER NOT NULL
+      );
+      CREATE TABLE embedding_attempts (
+        attempt_id TEXT PRIMARY KEY,
+        started_at INTEGER NOT NULL
+      );
+      CREATE INDEX idx_jobs_completed_at ON jobs (completed_at) WHERE completed_at IS NOT NULL;
+      CREATE INDEX idx_failed_jobs_failed_at ON failed_jobs (failed_at);
+      CREATE INDEX idx_job_batches_finished_at ON job_batches (finished_at);
+    `)
+  })
+
+  afterEach(() => sqlite.close())
+
+  it('deletes old finished rows and keeps active and recent ones', async () => {
+    const old = NOW - COMPLETED_JOB_RETENTION_SECONDS - DAY
+    sqlite.exec(`
+      INSERT INTO job_batches (id, finished_at) VALUES
+        ('batch-old', ${old}), ('batch-open', NULL), ('batch-recent', ${NOW - DAY});
+      INSERT INTO jobs (id, batch_id, completed_at) VALUES
+        ('done-old', 'batch-old', ${old}),
+        ('done-open-batch', 'batch-open', ${old}),
+        ('done-recent', NULL, ${NOW - DAY}),
+        ('active', NULL, NULL);
+      INSERT INTO failed_jobs (id, batch_id, failed_at) VALUES
+        ('failed-old', NULL, ${NOW - FAILED_JOB_RETENTION_SECONDS - DAY}),
+        ('failed-recent', NULL, ${NOW - DAY});
+      INSERT INTO embedding_attempts (attempt_id, started_at) VALUES
+        ('attempt-old', ${NOW - EMBEDDING_ATTEMPT_RETENTION_SECONDS - DAY}),
+        ('attempt-recent', ${NOW - DAY});
+    `)
+
+    const report = await pruneFinishedJobs(wrapSqlite(sqlite), { now: NOW })
+
+    expect(report).toEqual({
+      completedJobs: 1,
+      failedJobs: 1,
+      finishedBatches: 1,
+      embeddingAttempts: 1,
+      truncated: false,
+    })
+    expect(ids('jobs')).toEqual(['active', 'done-open-batch', 'done-recent'])
+    expect(ids('failed_jobs')).toEqual(['failed-recent'])
+    expect(ids('job_batches')).toEqual(['batch-open', 'batch-recent'])
+    expect(ids('embedding_attempts', 'attempt_id')).toEqual(['attempt-recent'])
+  })
+
+  it('keeps a finished batch while a job still names it', async () => {
+    const old = NOW - COMPLETED_JOB_RETENTION_SECONDS - DAY
+    sqlite.exec(`
+      INSERT INTO job_batches (id, finished_at) VALUES ('batch', ${old});
+      INSERT INTO jobs (id, batch_id, completed_at) VALUES ('member', 'batch', ${NOW - DAY});
+    `)
+
+    const report = await pruneFinishedJobs(wrapSqlite(sqlite), { now: NOW })
+
+    expect(report.finishedBatches).toBe(0)
+    expect(ids('job_batches')).toEqual(['batch'])
+  })
+
+  it('stops at the batch cap and reports the backlog', async () => {
+    const old = NOW - COMPLETED_JOB_RETENTION_SECONDS - DAY
+    const insert = sqlite.prepare(`INSERT INTO jobs (id, completed_at) VALUES (?, ?)`)
+    for (let i = 0; i < 7; i += 1)
+      insert.run(`done-${i}`, old)
+
+    const report = await pruneFinishedJobs(wrapSqlite(sqlite), { now: NOW, limit: 2, maxBatches: 2 })
+
+    expect(report.completedJobs).toBe(4)
+    expect(report.truncated).toBe(true)
+    expect(ids('jobs')).toHaveLength(3)
+  })
+
+  function ids(table: string, column = 'id'): string[] {
+    return sqlite.prepare(`SELECT ${column} AS id FROM ${table} ORDER BY id`).all().map(row => (row as { id: string }).id)
+  }
+})
+
+function wrapSqlite(sqlite: Database.Database): D1Database {
+  return {
+    prepare(sql: string) {
+      return {
+        bind(...params: unknown[]) {
+          return {
+            async run() {
+              const info = sqlite.prepare(sql).run(...params)
+              return { meta: { changes: info.changes } }
+            },
+          }
+        },
+      }
+    },
+  } as unknown as D1Database
+}
diff --git a/layers/registry/server/utils/finished-job-retention.ts b/layers/registry/server/utils/finished-job-retention.ts
new file mode 100644
index 00000000..df40c45f
--- /dev/null
+++ b/layers/registry/server/utils/finished-job-retention.ts
@@ -0,0 +1,171 @@
+/// <reference types="@cloudflare/workers-types" />
+
+/**
+ * How long a finished durable job row is kept.
+ *
+ * `completeJob` in nuxt-cf-jobs is a soft complete: the `jobs` row stays with
+ * its payload, `retry_reasons`, and `last_error`. The daily check-in reads a
+ * day or a week back, so seven days keeps every row it can ask for.
+ *
+ * Measured 2026-11-12: `jobs` held 146,816 rows, `failed_jobs` 2,672, and
+ * `job_batches` 3,332, from an hourly sync that writes up to 250 job rows
+ * and one batch row. Nothing deleted any of them.
+ */
+export const COMPLETED_JOB_RETENTION_SECONDS = 7 * 24 * 60 * 60
+
+/**
+ * Failed jobs are the only evidence of a permanent repository failure once
+ * `repo_sync_progress` is cleared, so they stay longer than completed ones.
+ */
+export const FAILED_JOB_RETENTION_SECONDS = 30 * 24 * 60 * 60
+
+/**
+ * Embedding attempts are provider evidence for one Vectorize upsert. The
+ * parity audit reads only the current `skill_generated` marker, so the
+ * attempt row matters for triage of a recent failure and nothing else.
+ */
+export const EMBEDDING_ATTEMPT_RETENTION_SECONDS = 30 * 24 * 60 * 60
+
+/**
+ * Rows one DELETE may remove. The subquery seeks an index, and 500 rows keep
+ * each statement well under D1's row budget.
+ */
+export const FINISHED_JOB_PRUNE_BATCH = 500
+
+/**
+ * DELETE statements one run may issue per table. Steady state needs one or
+ * two; the cap only binds while a backlog drains, and it keeps a run inside
+ * its scheduled runtime.
+ */
+export const FINISHED_JOB_PRUNE_MAX_BATCHES = 40
+
+export interface FinishedJobPruneReport {
+  completedJobs: number
+  failedJobs: number
+  finishedBatches: number
+  embeddingAttempts: number
+  /** True when a table still had a full batch to delete when the cap bound. */
+  truncated: boolean
+}
+
+/**
+ * Finished job rows nothing needs any more.
+ *
+ * The predicates match nuxt-cf-jobs's own prune methods: a member of a batch
+ * stays while its batch is unfinished, and a batch stays while any job still
+ * names it. Member rows go before their batches, so the batch delete never
+ * violates the `jobs.batch_id` foreign key.
+ */
+const DELETE_COMPLETED_JOBS = `
+  DELETE FROM jobs WHERE id IN (
+    SELECT id FROM jobs INDEXED BY idx_jobs_completed_at
+    WHERE completed_at IS NOT NULL
+      AND completed_at <= ?
+      AND (
+        batch_id IS NULL
+        OR NOT EXISTS (
+          SELECT 1 FROM job_batches
+          WHERE job_batches.id = jobs.batch_id AND job_batches.finished_at IS NULL
+        )
+      )
+    LIMIT ?
+  )
+`
+
+const DELETE_FAILED_JOBS = `
+  DELETE FROM failed_jobs WHERE id IN (
+    SELECT id FROM failed_jobs INDEXED BY idx_failed_jobs_failed_at
+    WHERE failed_at <= ?
+      AND (
+        batch_id IS NULL
+        OR NOT EXISTS (
+          SELECT 1 FROM job_batches
+          WHERE job_batches.id = failed_jobs.batch_id AND job_batches.finished_at IS NULL
+        )
+      )
+    LIMIT ?
+  )
+`
+
+const DELETE_FINISHED_BATCHES = `
+  DELETE FROM job_batches WHERE id IN (
+    SELECT id FROM job_batches INDEXED BY idx_job_batches_finished_at
+    WHERE finished_at IS NOT NULL
+      AND finished_at <= ?
+      AND NOT EXISTS (SELECT 1 FROM jobs WHERE jobs.batch_id = job_batches.id)
+      AND NOT EXISTS (SELECT 1 FROM failed_jobs WHERE failed_jobs.batch_id = job_batches.id)
+      AND (
+        parent_batch_id IS NULL
+        OR NOT EXISTS (
+          SELECT 1 FROM job_batches parent
+          WHERE parent.id = job_batches.parent_batch_id AND parent.finished_at IS NULL
+        )
+      )
+    LIMIT ?
+  )
+`
+
+/**
+ * A started attempt older than the window is one the Worker never finished,
+ * so it is as settled as a terminal one.
+ */
+const DELETE_EMBEDDING_ATTEMPTS = `
+  DELETE FROM embedding_attempts WHERE attempt_id IN (
+    SELECT attempt_id FROM embedding_attempts
+    WHERE started_at <= ?
+    LIMIT ?
+  )
+`
+
+async function deleteInBatches(
+  db: D1Database,
+  sql: string,
+  cutoff: number,
+  limit: number,
+  maxBatches: number,
+): Promise<{ deleted: number, truncated: boolean }> {
+  let deleted = 0
+  for (let batch = 0; batch < maxBatches; batch += 1) {
+    const result = await db.prepare(sql).bind(cutoff, limit).run()
+    const changes = result.meta.changes ?? 0
+    deleted += changes
+    if (changes < limit)
+      return { deleted, truncated: false }
+  }
+  return { deleted, truncated: true }
+}
+
+/**
+ * Delete finished durable job rows and old embedding attempts, in bounded
+ * batches. Returns how many rows each table lost.
+ */
+export async function pruneFinishedJobs(
+  db: D1Database,
+  input: {
+    now: number
+    limit?: number
+    maxBatches?: number
+    completedRetentionSeconds?: number
+    failedRetentionSeconds?: number
+    embeddingAttemptRetentionSeconds?: number
+  },
+): Promise<FinishedJobPruneReport> {
+  const limit = input.limit ?? FINISHED_JOB_PRUNE_BATCH
+  const maxBatches = input.maxBatches ?? FINISHED_JOB_PRUNE_MAX_BATCHES
+  const completedCutoff = input.now - (input.completedRetentionSeconds ?? COMPLETED_JOB_RETENTION_SECONDS)
+  const failedCutoff = input.now - (input.failedRetentionSeconds ?? FAILED_JOB_RETENTION_SECONDS)
+  const attemptCutoff = input.now - (input.embeddingAttemptRetentionSeconds ?? EMBEDDING_ATTEMPT_RETENTION_SECONDS)
+
+  const completed = await deleteInBatches(db, DELETE_COMPLETED_JOBS, completedCutoff, limit, maxBatches)
+  const failed = await deleteInBatches(db, DELETE_FAILED_JOBS, failedCutoff, limit, maxBatches)
+  const batches = await deleteInBatches(db, DELETE_FINISHED_BATCHES, completedCutoff, limit, maxBatches)
+  const attempts = await deleteInBatches(db, DELETE_EMBEDDING_ATTEMPTS, attemptCutoff, limit, maxBatches)
+
+  return {
+    completedJobs: completed.deleted,
+    failedJobs: failed.deleted,
+    finishedBatches: batches.deleted,
+    embeddingAttempts: attempts.deleted,
+    truncated: completed.truncated || failed.truncated || batches.truncated || attempts.truncated,
+  }
+}
diff --git a/shared/schedule-policy.ts b/shared/schedule-policy.ts
index 511a7da9..2e7c3ce6 100644
--- a/shared/schedule-policy.ts
+++ b/shared/schedule-policy.ts
@@ -67,6 +67,7 @@ export const SCHEDULE_POLICY = [
   { _tag: 'observed', taskName: 'embedding-parity-audit', cron: '0 21 * * *', maxSilenceSeconds: 36 * 60 * 60, maxRuntimeSeconds: 30 * 60 },
   // First cron fire, not the authoring date: a grace anchored to 2026-09-17
   // expired before the deployed trigger ever fired and read as missing_run.
+  { _tag: 'observed', taskName: 'prune-finished-jobs', cron: '40 * * * *', maxSilenceSeconds: 3 * 60 * 60, maxRuntimeSeconds: 4 * 60 },
   { _tag: 'observed', taskName: 'purge-personal-data', cron: '30 4 * * *', maxSilenceSeconds: 36 * 60 * 60, maxRuntimeSeconds: 10 * 60, activeFromSeconds: 1790051400 },
   { _tag: 'observed', taskName: 'recompute-skill-scores', cron: '0 3 * * *', maxSilenceSeconds: 36 * 60 * 60, maxRuntimeSeconds: 60 * 60 },
   { _tag: 'observed', taskName: 'refresh-x-engagement', cron: '10 * * * *', maxSilenceSeconds: 3 * 60 * 60, maxRuntimeSeconds: 30 * 60 },