add auto migrations

backend/Dockerfile

@@ -21,6 +21,10 @@ RUN poetry config virtualenvs.create false \
 # Copy application code
 COPY src/ ./src/
 
+# Copy Alembic files for migrations
+COPY alembic.ini ./
+COPY alembic/ ./alembic/
+
 # Create directory for SQLite database
 RUN mkdir -p /app/data