V6 Phase 2 complete

tools/export_import_migration.py

@@ -17,6 +17,7 @@ Usage examples:
 from __future__ import annotations
 
 import argparse
+import json
 from pathlib import Path
 from typing import Final
 
@@ -27,6 +28,7 @@ from transcription.db.migration import export_bundle
 from transcription.db.migration import import_bundle
 from transcription.db.migration import migrate_via_bundle
 from transcription.db.migration import sqlite_url_from_path
+from transcription.db.migration import verify_migration
 
 DEFAULT_BUNDLE_DIR: Final[Path] = Path(".migration-bundle")
 
@@ -77,6 +79,7 @@ def main() -> int:
     subparsers.add_parser("export", parents=[common], help="Export DB rows and uploads into bundle")
     subparsers.add_parser("import", parents=[common], help="Import bundle into target DB and uploads")
     subparsers.add_parser("migrate", parents=[common], help="Run export then import in one command")
+    subparsers.add_parser("verify", parents=[common], help="Compare source/target row counts and integrity checks")
 
     args = parser.parse_args()
     bundle_dir = Path(args.bundle_dir)
@@ -104,6 +107,11 @@ def main() -> int:
         print(f"Import complete: db={target_db_url} uploads={target_upload_dir}")
         return 0
 
+    if args.command == "verify":
+        report = verify_migration(source_db_url=source_db_url, target_db_url=target_db_url)
+        print(json.dumps(report.to_dict(), indent=2))
+        return 0 if report.success else 1
+
     migrate_via_bundle(
         MigrationPaths(
             source_db_url=source_db_url,