test(persistence): bump bootstrap head pins to 0007_feedback_tags

The feedback migration (0007_feedback_tags) advanced the alembic chain
head, but the bootstrap/migration tests still hardcoded 0006_agents as
the expected head. Update the HEAD constants and the post-upgrade
version assertions so the head-pin guard and the legacy/concurrency
bootstrap tests match the current chain tip. Test-only; no migration or
schema change.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/tests/test_migration_0004_run_ownership_dedupe.py

@@ -156,7 +156,7 @@ async def test_migration_dedupes_duplicate_active_rows_before_unique_index(tmp_p
 
         with sqlite3.connect(db_path) as raw:
             version_row = raw.execute("SELECT version_num FROM alembic_version").fetchone()
-        assert version_row[0] == "0006_agents"
+        assert version_row[0] == "0007_feedback_tags"
 
         # Sanity: the invariant the index enforces is now true — at most one
         # active row per thread.

backend/tests/test_persistence_bootstrap.py

@@ -48,7 +48,7 @@ from deerflow.persistence.migrations._helpers import _normalize_default
 asyncio_test = pytest.mark.asyncio
 
 
-HEAD = "0006_agents"
+HEAD = "0007_feedback_tags"
 BASELINE = "0001_baseline"
 
 

backend/tests/test_persistence_bootstrap_concurrency.py

@@ -28,7 +28,7 @@ from deerflow.persistence.bootstrap import bootstrap_schema
 pytestmark = pytest.mark.asyncio
 
 
-HEAD = "0006_agents"
+HEAD = "0007_feedback_tags"
 
 
 def _url(tmp_path: Path) -> str:

backend/tests/test_persistence_bootstrap_regression.py

@@ -76,7 +76,7 @@ async def test_legacy_database_recovers_token_usage_column(tmp_path: Path) -> No
             cols = {row[1] for row in raw.execute("PRAGMA table_info(runs)").fetchall()}
             assert "token_usage_by_model" in cols
             version_row = raw.execute("SELECT version_num FROM alembic_version").fetchone()
-            assert version_row[0] == "0006_agents"
+            assert version_row[0] == "0007_feedback_tags"
 
         # And the read path that originally 500'd must now succeed.
         sf = get_session_factory()
@@ -116,6 +116,6 @@ async def test_legacy_database_with_manual_alter_still_bootstraps(tmp_path: Path
             # No duplicate column -- list, not set, to catch dupes.
             assert cols.count("token_usage_by_model") == 1
             version_row = raw.execute("SELECT version_num FROM alembic_version").fetchone()
-            assert version_row[0] == "0006_agents"
+            assert version_row[0] == "0007_feedback_tags"
     finally:
         await close_engine()