fix: load numbered migration module dynamically

backend/app/core/deps.py

@@ -23,10 +23,12 @@ async def get_db() -> AsyncGenerator[AsyncSession, None]:
 
 async def init_db():
     """Apply non-destructive schema upgrades before creating missing tables."""
+    from importlib import import_module
+
     from app.models import Base
-    from migrations.versions.20260803_reliability_monitoring import (
-        run_reliability_migration,
-    )
+
+    migration = import_module("migrations.versions.20260803_reliability_monitoring")
+    run_reliability_migration = migration.run_reliability_migration
 
     async with engine.begin() as conn:
         await conn.run_sync(run_reliability_migration)

backend/tests/test_deps_import.py

@@ -0,0 +1,10 @@
+"""Regression coverage for application dependency module imports."""
+
+from pathlib import Path
+
+
+def test_dependency_module_compiles():
+    """Database initialization dependencies remain valid Python syntax."""
+    module_path = Path(__file__).parents[1] / "app" / "core" / "deps.py"
+
+    compile(module_path.read_text(encoding="utf-8"), str(module_path), "exec")