feat(infra): automated database query execution time logging for slow query detection (Closes #1365)

[camesenin]

Summary

Closes #1365

This PR implements automated database query execution time logging for slow query detection (>200ms) with dual reporting to CloudWatch (via structured Pino logs) and Sentry.

Key Changes

• Slow Query Monitoring Engine (backend/src/db/queryLogger.js):
  • Measures execution time across SQLite (better-sqlite3) and Postgres (pg.Pool).
  • Alerts when query execution exceeds threshold (default 200ms, configurable via SLOW_QUERY_THRESHOLD_MS).
  • Formats structured JSON log payloads for CloudWatch with duration, threshold, sanitized parameters, and SQL query.
  • Sends warning events to Sentry with context tags.
  • Parameter sanitizer masks sensitive data (passwords, tokens, API keys, secrets).
• DAL Integration (backend/src/dal/index.js):
  • Automatically wraps SQLite and Postgres connections created via createDal.
• Migration standard alignment:
  • Standardized numeric version exports on recent SQLite migrations.
• Tests:
  • Comprehensive unit test suite in backend/src/db/queryLogger.test.js covering threshold filtering, parameter redaction, and both SQLite and PostgreSQL query interceptions.

[camesenin]

Hi @Gbangbolaoluwagbemiga @joelpeace48-cell, this PR is ready for review with all tests passing. Could you please assign me to this issue on Drips Wave (@camesenin) so that it is properly tracked for Wave 9 before merging? Thank you!