docs(database): implement database backup and restore documentation (closes #164)

[ranjeet150]

Summary of Changes

Closes #164.

Delivers comprehensive operational documentation and automation tooling for PostgreSQL database backup, verification, and recovery in and [2026-09-19T14:05:32+05:45] Initiating TaskBounty database backup for 'taskbounty'....

Key Items Delivered:

1. Backup Procedures:

   • Step-by-step documentation for PostgreSQL custom format dumps () with SHA-256 integrity checksum generation.
   • Plain SQL compressed exports for human-readable auditability and cross-version migrations.
   • Automated shell script ([2026-09-19T14:05:33+05:45] Initiating TaskBounty database backup for 'taskbounty'...) with retention pruning (configurable via ).

2. Restore Procedures:

   • Full disaster recovery procedure to a fresh database with connection termination (), clean schema wipe, and parallel .
   • Selective table recovery instructions for partial data corruption triage.
   • Post-restore verification checklist (record count validation, sequence continuity, and ).

3. Required Precautions & Safety Guardrails:

   • Credential protection protocols (strict ban on hardcoded secrets, utilization of / environment secrets).
   • Backup-at-rest encryption standards (GPG / AES-256 before object storage offloading).
   • Storage volume overhead sizing (verifying minimum 2.5x database capacity).
   • Non-blocking consistent snapshots via .

4. Sample Environment Testing Playbook:

   • Hands-on 7-step test playbook using an isolated local Docker PostgreSQL container.
   • Simulated test table creation, sample data seeding, logical dump execution, catastrophic drop simulation, successful restore verification, and container teardown.

5. Navigation Index:

   • Indexed the new guide in under the Operations & Guides section.