diff --git a/docs/connection-collection.md b/docs/connection-collection.md
index aa3ef029..e73a8902 100644
--- a/docs/connection-collection.md
+++ b/docs/connection-collection.md
@@ -108,7 +108,8 @@ continuing permission or a reusable session. Expired sessions, revoked devices a
 membership are purged independently of workflow runs. Switching to browser-only clears the
 session immediately and fences active cloud uploads; disconnecting uses the existing
 integration revocation path. Old single-run transfers remain run-bound and are deleted on
-finalization. An account change or LinkedIn challenge requires attention, not an automatic
+finalization. Deleting the project removes its collection jobs, collected pages, leases and
+devices. An account change or LinkedIn challenge requires attention, not an automatic
 cloud/local retry.
 
 Setup verifies and saves the login without requiring a search-query identifier. The current
diff --git a/docs/project-deletion-implementation.md b/docs/project-deletion-implementation.md
index 0388870b..8b3b8eae 100644
--- a/docs/project-deletion-implementation.md
+++ b/docs/project-deletion-implementation.md
@@ -50,6 +50,10 @@ Under `effect_lock("project-delete:{project_id}:{request_id}", "project_delete")
    reconciliation loop retries), `CodeStorage.delete_repo`. A failure marks the receipt failed
    and raises `ProjectDeletionPending`; the same `request_id` retries every later phase.
 3. One transaction: `purge_project_data`, clear `temporal_schedule_id`, `complete_effect`.
+   The purge removes everything the project owns except its runs, saved workflows and billing,
+   including the people LinkedIn collection gathered, author bindings and task transcripts.
+   `tests/test_project_purge.py` fails when a table holding project data is neither purged
+   nor listed there as kept on purpose.
 
 A completed receipt replays its result. A fresh `request_id` on a deleted project runs every
 phase as a no-op and returns the original `deleted_at` with zero counts. One `project_deleted`
diff --git a/src/tin_lite/db.py b/src/tin_lite/db.py
index e9f774f3..d321719f 100644
--- a/src/tin_lite/db.py
+++ b/src/tin_lite/db.py
@@ -6857,6 +6857,16 @@ async def purge_project_data(self, conn: asyncpg.Connection, *, project_id: UUID
             "DELETE FROM run_rollouts WHERE run_id IN "
             "(SELECT id FROM workflow_runs WHERE project_id = $1)",
             "DELETE FROM project_test_identities WHERE project_id = $1",
+            "DELETE FROM project_task_entries WHERE run_id IN "
+            "(SELECT id FROM workflow_runs WHERE project_id = $1)",
+            "DELETE FROM project_authors WHERE project_id = $1",
+            # LinkedIn collection holds other people's names, headlines and page text. Jobs (and
+            # their pages) go before the connections: a job interrupted mid-lease still points at
+            # its extension device, which would block the devices' cascade.
+            "DELETE FROM connection_collection_jobs WHERE project_id = $1",
+            "DELETE FROM connection_collection_account_leases WHERE run_id IN "
+            "(SELECT id FROM workflow_runs WHERE project_id = $1)",
+            "DELETE FROM connection_extension_devices WHERE project_id = $1",
             "DELETE FROM integration_auth_attempts WHERE project_id = $1",
             "DELETE FROM integration_call_receipts WHERE project_id = $1",
             # Failed-payment recovery keeps Stripe and mailbox evidence in its run receipts and
diff --git a/tests/test_project_purge.py b/tests/test_project_purge.py
new file mode 100644
index 00000000..980f0402
--- /dev/null
+++ b/tests/test_project_purge.py
@@ -0,0 +1,133 @@
+"""Deleting a project removes what it owns, including the people it collected."""
+
+import inspect
+import re
+from uuid import uuid4
+
+from test_connection_collection import ACTOR, TOKEN, batch, seed
+from test_procedure_publication import publication_db as publication_db
+
+from tin_lite.db import Database
+
+# Tables that deliberately outlive a deleted project, behind its tombstone.
+KEPT = {
+    # The tombstone itself, and the runs and saved workflows the billing ledger references.
+    "projects",
+    "workflow_runs",
+    "workflows",
+    "project_workflows",
+    "billing_ledger",
+    "billing_operations",
+    "billing_project_policies",
+    "billing_quotes",
+    "billing_run_budgets",
+    "run_payment_cards",
+    # Provider deliveries stay with the provider; the purge clears their project link.
+    "integration_webhook_deliveries",
+    # No personal data. Whether Tin keeps its record of the Google Ads campaigns it created
+    # after the project is gone is a paid-ads decision, made separately.
+    "paid_ads_campaigns",
+    "paid_ads_proposals",
+}
+
+
+# What the seeded project owns that the purge must remove: its run's rows, then its own.
+OWNED = """SELECT
+    (SELECT count(*) FROM connection_collection_pages WHERE run_id = $1) AS pages,
+    (SELECT count(*) FROM connection_collection_account_leases WHERE run_id = $1) AS leases,
+    (SELECT count(*) FROM project_task_entries WHERE run_id = $1) AS task_entries,
+    (SELECT count(*) FROM connection_collection_jobs WHERE project_id = $2) AS jobs,
+    (SELECT count(*) FROM connection_extension_devices WHERE project_id = $2) AS devices,
+    (SELECT count(*) FROM project_authors WHERE project_id = $2) AS authors"""
+
+
+def cleaned_by_deletion() -> set[str]:
+    source = inspect.getsource(Database.purge_project_data) + inspect.getsource(
+        Database.revoke_project_access
+    )
+    return set(re.findall(r"DELETE FROM (\w+)", source))
+
+
+async def test_every_project_table_is_purged_or_kept_on_purpose(publication_db):
+    """A new table that holds a project's data must join the purge or KEPT, never neither."""
+    rows = await publication_db.pool.fetch(
+        """
+        SELECT c.relname AS name,
+               EXISTS (SELECT 1 FROM pg_attribute a WHERE a.attrelid = c.oid
+                       AND a.attname = 'project_id' AND NOT a.attisdropped) AS has_project_id
+        FROM pg_class c
+        WHERE c.relkind = 'r' AND c.relnamespace = current_schema()::regnamespace
+        """
+    )
+    edges = await publication_db.pool.fetch(
+        """
+        SELECT child.relname AS child, parent.relname AS parent, con.confdeltype::text AS action
+        FROM pg_constraint con
+        JOIN pg_class child ON child.oid = con.conrelid
+        JOIN pg_class parent ON parent.oid = con.confrelid
+        WHERE con.contype = 'f' AND child.relnamespace = current_schema()::regnamespace
+        """
+    )
+    tables = {row["name"] for row in rows}
+    scoped = {row["name"] for row in rows if row["has_project_id"]}
+    owners = {"projects", "workflow_runs", "integration_connections"}
+    changed = True
+    while changed:
+        before = len(scoped)
+        # Rows hanging off a kept table (a user's saved templates, a welcome grant) are not the
+        # project's, so scope spreads only through what the project owns outright.
+        scoped |= {e["child"] for e in edges if e["parent"] in owners | (scoped - KEPT)}
+        changed = len(scoped) != before
+    cleaned = cleaned_by_deletion()
+    changed = True
+    while changed:
+        before = len(cleaned)
+        cleaned |= {e["child"] for e in edges if e["parent"] in cleaned and e["action"] == "c"}
+        changed = len(cleaned) != before
+    assert not KEPT - tables, f"KEPT names missing tables: {', '.join(sorted(KEPT - tables))}"
+    both = KEPT & cleaned_by_deletion()
+    assert not both, f"purged tables listed in KEPT: {', '.join(sorted(both))}"
+    left = scoped - cleaned - KEPT - {"projects"}
+    assert not left, f"project data the purge leaves behind: {', '.join(sorted(left))}"
+
+
+async def test_purge_removes_collected_people_authors_and_task_transcripts(publication_db):
+    f = await seed(publication_db)
+    db = f.db
+    # A collection interrupted mid-lease: the job still holds its device.
+    claim = await f.store.claim(f.run.id, f.project.id, TOKEN, ACTOR["key"])
+    await f.store.page(f.run.id, f.project.id, TOKEN, batch(claim))
+    other = await db.create_project(name="Kept", state_repo_id=f"projects/{uuid4()}")
+    for project in (f.project, other):
+        await db.pool.execute(
+            """INSERT INTO project_authors (project_id, id, display_name, guide_path,
+                   confirmed_by_clerk_user_id)
+               VALUES ($1, $2, 'Founder', $3, 'user_owner')""",
+            project.id,
+            uuid4(),
+            f".agents/skills/authors/{uuid4()}/SKILL.md",
+        )
+    await db.pool.execute(
+        """INSERT INTO project_task_entries (id, run_id, kind, source, content)
+           VALUES ($1, $2, 'message', 'codex', 'A task transcript line')""",
+        uuid4(),
+        f.run.id,
+    )
+
+    before = await db.pool.fetchrow(OWNED, f.run.id, f.project.id)
+    assert all(before.values()), dict(before)
+
+    async with db.pool.acquire() as conn:
+        await db.purge_project_data(conn, project_id=f.project.id)
+        await db.purge_project_data(conn, project_id=f.project.id)
+
+    left = await db.pool.fetchrow(OWNED, f.run.id, f.project.id)
+    assert dict(left) == dict.fromkeys(left.keys(), 0)
+    assert (
+        await db.pool.fetchval(
+            "SELECT count(*) FROM project_authors WHERE project_id = $1", other.id
+        )
+        == 1
+    )
+    # Runs stay behind the tombstone for the billing ledger.
+    assert await db.pool.fetchval("SELECT count(*) FROM workflow_runs WHERE id = $1", f.run.id) == 1