fix: handle concurrent table creation race in SQLite (#151)

src/dashboard/models/database.py

@@ -1,9 +1,18 @@
+import logging
+from pathlib import Path
+
 from sqlalchemy import create_engine
+from sqlalchemy.exc import OperationalError
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm import Session, sessionmaker
 
+logger = logging.getLogger(__name__)
+
 SQLALCHEMY_DATABASE_URL = "sqlite:///./data/timmy_calm.db"
 
+# Ensure the data directory exists before creating the engine
+Path("./data").mkdir(parents=True, exist_ok=True)
+
 engine = create_engine(SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False})
 
 SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
@@ -12,8 +21,11 @@ Base = declarative_base()
 
 
 def create_tables():
-    """Create all tables defined by models that have imported Base."""
-    Base.metadata.create_all(bind=engine)
+    """Create all tables idempotently (safe under pytest-xdist concurrency)."""
+    try:
+        Base.metadata.create_all(bind=engine)
+    except OperationalError as exc:
+        logger.debug("Table creation skipped (already exists): %s", exc)
 
 
 def get_db():