fixed tests

backend/app/db.py

@@ -14,6 +14,7 @@ from __future__ import annotations
 from pathlib import Path
 
 import aiosqlite
+
 from app.utils.logging_compat import get_logger
 
 log = get_logger(__name__)
@@ -246,7 +247,6 @@ CREATE INDEX IF NOT EXISTS idx_import_log_source_id_desc
 }
 
 
-
 # ---------------------------------------------------------------------------
 # Public API
 # ---------------------------------------------------------------------------
@@ -254,6 +254,7 @@ CREATE INDEX IF NOT EXISTS idx_import_log_source_id_desc
 
 async def _configure_connection(db: aiosqlite.Connection) -> None:
     """Apply hardening pragmas to a newly-opened SQLite connection."""
+    await db.execute("PRAGMA journal_mode=WAL;")
     await db.execute("PRAGMA foreign_keys=ON;")
     await db.execute("PRAGMA busy_timeout=5000;")
 
@@ -271,11 +272,18 @@ async def _cleanup_wal_files(db_path: str) -> None:
     Args:
         db_path: Path to the database file.
     """
+    import time
+
     wal_path = Path(db_path + "-wal")
     shm_path = Path(db_path + "-shm")
 
     for path in (wal_path, shm_path):
         if path.exists():
+            # Skip files that were modified recently — they likely belong to an
+            # active connection.  Only remove stale files left by crashes.
+            mtime = path.stat().st_mtime
+            if time.time() - mtime < 10:
+                continue
             try:
                 path.unlink()
                 log.warning("orphaned_sqlite_file_removed", path=str(path))
@@ -313,17 +321,17 @@ async def _parse_migration_statements(script: str) -> list[str]:
         char = script[i]
 
         # Skip block comments (-- ...)
-        if i < len(script) - 1 and script[i:i+2] == "--":
+        if i < len(script) - 1 and script[i : i + 2] == "--":
             while i < len(script) and script[i] != "\n":
                 i += 1
             i += 1
             continue
 
         # Skip line comments (/* ... */)
-        if i < len(script) - 1 and script[i:i+2] == "/*":
+        if i < len(script) - 1 and script[i : i + 2] == "/*":
             i += 2
             while i < len(script) - 1:
-                if script[i:i+2] == "*/":
+                if script[i : i + 2] == "*/":
                     i += 2
                     break
                 i += 1
@@ -393,7 +401,15 @@ async def _apply_migration(db: aiosqlite.Connection, version: int) -> None:
         await db.execute("BEGIN IMMEDIATE;")
 
         for statement in statements:
-            await db.execute(statement)
+            try:
+                await db.execute(statement)
+            except aiosqlite.OperationalError as exc:
+                # Ignore duplicate column / table errors so migrations remain
+                # idempotent when a legacy database already has the object.
+                msg = str(exc).lower()
+                if "duplicate column name" in msg or "table" in msg and "already exists" in msg:
+                    continue
+                raise
 
         await db.execute("INSERT INTO schema_migrations (version) VALUES (?);", (version,))
 
@@ -411,8 +427,7 @@ async def _migrate_schema(db: aiosqlite.Connection) -> None:
 
     if current_version > _CURRENT_SCHEMA_VERSION:
         raise RuntimeError(
-            f"database schema version {current_version} is newer than supported "
-            f"version {_CURRENT_SCHEMA_VERSION}"
+            f"database schema version {current_version} is newer than supported version {_CURRENT_SCHEMA_VERSION}"
         )
 
     log.info("migrating_database_schema", from_version=current_version, to_version=_CURRENT_SCHEMA_VERSION)