Add migration for performance indexes

The indexes defined in models.py __table_args__ are not automatically
created by the custom migration system. Added migrate_performance_indexes()
to explicitly create the indexes at startup.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

containers/backupchecks/src/backend/app/migrations.py

@@ -930,6 +930,7 @@ def run_migrations() -> None:
     migrate_news_tables()
     migrate_reporting_tables()
     migrate_reporting_report_config()
+    migrate_performance_indexes()
     print("[migrations] All migrations completed.")
 
 
@@ -1114,6 +1115,46 @@ def migrate_jobs_archiving() -> None:
     print("[migrations] migrate_jobs_archiving completed.")
 
 
+def migrate_performance_indexes() -> None:
+    """Add performance indexes for frequently queried foreign key columns.
+
+    These indexes significantly improve query performance on slow storage,
+    especially for Daily Jobs and Run Checks pages.
+
+    This migration is idempotent.
+    """
+    try:
+        engine = db.get_engine()
+    except Exception as exc:
+        print(f"[migrations] Could not get engine for performance indexes migration: {exc}")
+        return
+
+    with engine.begin() as conn:
+        # JobRun indexes
+        conn.execute(text('CREATE INDEX IF NOT EXISTS idx_job_run_job_id ON job_runs (job_id)'))
+        conn.execute(text('CREATE INDEX IF NOT EXISTS idx_job_run_job_id_run_at ON job_runs (job_id, run_at)'))
+        conn.execute(text('CREATE INDEX IF NOT EXISTS idx_job_run_job_id_reviewed_at ON job_runs (job_id, reviewed_at)'))
+        conn.execute(text('CREATE INDEX IF NOT EXISTS idx_job_run_mail_message_id ON job_runs (mail_message_id)'))
+
+        # MailMessage indexes
+        conn.execute(text('CREATE INDEX IF NOT EXISTS idx_mail_message_job_id ON mail_messages (job_id)'))
+        conn.execute(text('CREATE INDEX IF NOT EXISTS idx_mail_message_location ON mail_messages (location)'))
+        conn.execute(text('CREATE INDEX IF NOT EXISTS idx_mail_message_job_id_location ON mail_messages (job_id, location)'))
+
+        # MailObject indexes
+        conn.execute(text('CREATE INDEX IF NOT EXISTS idx_mail_object_mail_message_id ON mail_objects (mail_message_id)'))
+
+        # TicketScope indexes
+        conn.execute(text('CREATE INDEX IF NOT EXISTS idx_ticket_scope_ticket_id ON ticket_scopes (ticket_id)'))
+        conn.execute(text('CREATE INDEX IF NOT EXISTS idx_ticket_scope_job_id ON ticket_scopes (job_id)'))
+
+        # RemarkScope indexes
+        conn.execute(text('CREATE INDEX IF NOT EXISTS idx_remark_scope_remark_id ON remark_scopes (remark_id)'))
+        conn.execute(text('CREATE INDEX IF NOT EXISTS idx_remark_scope_job_id ON remark_scopes (job_id)'))
+
+    print("[migrations] migrate_performance_indexes completed.")
+
+
 def migrate_reporting_report_config() -> None:
     """Add report_definitions.report_config column if missing.
 

docs/changelog-claude.md

@@ -13,7 +13,7 @@ This file documents all changes made to this project via Claude Code.
 - Filled README.md with comprehensive project documentation based on source code analysis
 
 ### Performance
-- Added database indexes to `models.py` for frequently queried foreign key columns:
+- Added database indexes migration (`migrations.py`) for frequently queried foreign key columns:
   - `JobRun`: indexes on `job_id`, `job_id+run_at`, `job_id+reviewed_at`, `mail_message_id`
   - `MailMessage`: indexes on `job_id`, `location`, `job_id+location`
   - `MailObject`: index on `mail_message_id`