feat(docker): docker_logs table + docker_009 migration [M79 step 2]

Dedicated host-scoped table for pushed container log lines (one row per line),
chained after docker_008. host_id FK CASCADE; twin indexes — (host_id,
container_name, ts) for the viewer, ts alone for the age-cutoff prune — mirroring
docker_events. Integration schema-shape test asserts columns + both indexes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CAGR73DUowdVFVvYzLXC5C

tests/integration/test_docker.py

@@ -75,6 +75,28 @@ def test_events_and_swarm_tables_exist(app):
     asyncio.run(_go())
 
 
+@_NEEDS_DB
+def test_docker_logs_table_shape(app):
+    """docker_009 created docker_logs: host-scoped, with the twin indexes the
+    viewer (host, container, ts) and the age-cutoff prune (ts) rely on."""
+    from sqlalchemy import text
+
+    async def _go():
+        async with app.db_sessionmaker() as s:
+            cols = {r[0] for r in (await s.execute(text(
+                "SELECT column_name FROM information_schema.columns "
+                "WHERE table_name = 'docker_logs'"))).all()}
+            assert cols, "docker_logs missing entirely"
+            assert {"id", "host_id", "container_name", "ts", "stream", "line"} <= cols
+            idx = {r[0] for r in (await s.execute(text(
+                "SELECT indexname FROM pg_indexes "
+                "WHERE tablename = 'docker_logs'"))).all()}
+            assert "ix_docker_logs_host_container_time" in idx
+            assert "ix_docker_logs_ts" in idx
+
+    asyncio.run(_go())
+
+
 def _persist_fn(app):
     """Resolve persist_host_docker via the registered capability if the docker
     plugin is loaded, else import it directly (the import is safe only when the