feat: add standalone metric YAML → DuckDB migration script

scripts/migrate_metrics_to_duckdb.py

@@ -0,0 +1,38 @@
+"""Migrate metric YAML files to DuckDB metric_definitions table.
+
+Usage:
+    python scripts/migrate_metrics_to_duckdb.py [--metrics-dir docs/metrics]
+"""
+
+import argparse
+import logging
+import sys
+from pathlib import Path
+
+logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")
+logger = logging.getLogger(__name__)
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Migrate metric YAMLs to DuckDB")
+    parser.add_argument("--metrics-dir", default="docs/metrics", help="Path to metrics directory")
+    args = parser.parse_args()
+
+    metrics_dir = Path(args.metrics_dir)
+    if not metrics_dir.is_dir():
+        logger.error("Metrics directory not found: %s", metrics_dir)
+        sys.exit(1)
+
+    from src.db import get_system_db
+    from src.repositories.metrics import MetricRepository
+    conn = get_system_db()
+    try:
+        repo = MetricRepository(conn)
+        count = repo.import_from_yaml(metrics_dir)
+        logger.info("Imported %d metrics from %s", count, metrics_dir)
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    main()