Enhance backup system with comprehensive scripts and documentation

Database Backup Scripts:
- Add db-dump--standalone.sh for online database dumps (no downtime)
- Add db-restore-from-dump--standalone.sh for restoring from dumps
- Rename backup scripts with double-dash convention for clarity
- Add comprehensive header comments to all backup/restore scripts
- Document online vs offline, standalone vs swarm deployment types
- Add KEEP variable default (7) to dump script for rotation

Docker Configuration:
- Add mongo-backup volume mount to docker-compose-standalone.yaml
- Add mongo-backup volume mount to docker-compose-debug.yml
- Add container names to debug compose for consistency with standalone

Documentation:
- Add comprehensive Database Backup & Restore section to README.md
- Document all backup scripts with usage examples
- Document automated cron schedule (04:00 daily)
- Sunday: Full volume backup (KEEP=2, offline)
- Monday-Saturday: Database dumps (KEEP=7, online)
- Document backup directories and log file locations

Git Configuration:
- Add mongo-backup/ to .gitignore
- Fix missing newline at end of .gitignore

File Cleanup:
- Remove db-scheduled-backup.sh (superseded by cron jobs)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

README.md

@@ -17,6 +17,75 @@ Each location record is marked with a user ID.
 
 All the actions user `withUser` to fetch user ID, which is then used in all the DB operations.
 
+# Database Backup & Restore
+
+The project includes multiple backup strategies for different deployment scenarios and requirements.
+
+## Backup Scripts Overview
+
+### Standalone Docker Deployments
+
+**Online Backups (No Downtime):**
+- `db-dump--standalone.sh` - Creates online backup of the 'utility-bills' database using mongodump
+  - Database stays running during backup
+  - Only backs up the database content, not the full volume
+  - Output: `./mongo-backup/utility-bills-dump-YYYY-MM-DD_HH-MM.tar.gz`
+  - Default retention: 7 backups (configurable via `KEEP` env var)
+  - Usage: `./db-dump--standalone.sh` or `KEEP=10 ./db-dump--standalone.sh`
+
+- `db-restore-from-dump--standalone.sh` - Restores from mongodump archives
+  - Database stays running during restore
+  - **WARNING**: Drops existing collections before restore
+  - Usage: `./db-restore-from-dump--standalone.sh utility-bills-dump-2025-11-26_14-30.tar.gz`
+
+**Offline Backups (With Downtime):**
+- `db-backup--standalone.sh` - Creates offline backup of the complete mongo-volume directory
+  - Database container is stopped during backup for consistency
+  - Backs up the entire MongoDB data directory
+  - Output: `./backups/mongo-volume-backup-YYYY-MM-DD-HH-MM.tar.gz`
+  - Default retention: 7 backups (configurable via `KEEP` env var)
+  - Usage: `./db-backup--standalone.sh` or `KEEP=2 ./db-backup--standalone.sh`
+
+### Docker Swarm Deployments
+
+- `db-backup--swarm.sh` - Creates offline backup by scaling down the MongoDB service
+  - Service is scaled to 0 during backup
+  - Output: `./backups/mongo-volume-backup-YYYY-MM-DD-HH-MM.tar.gz`
+  - Usage: `./db-backup--swarm.sh`
+
+- `db-restore-from-backup--swarm.sh` - Restores volume backup by scaling down the service
+  - Service is scaled to 0 during restore
+  - Optional `--pre-backup` flag for safety backup before restore
+  - Usage: `./db-restore-from-backup--swarm.sh mongo-volume-backup-2025-11-26-14-30.tar.gz`
+
+## Automated Backup Schedule
+
+Backups run automatically via cron at 04:00 every day:
+
+```cron
+# Sunday: Full volume backup (offline), keep 2 backups
+0 4 * * 0 cd /home/knee-cola/web-pro/evidencija-rezija && KEEP=2 ./db-backup--standalone.sh
+
+# Monday-Saturday: Database dump (online), keep 7 backups
+0 4 * * 1-6 cd /home/knee-cola/web-pro/evidencija-rezija && KEEP=7 ./db-dump--standalone.sh
+```
+
+**Backup Strategy:**
+- **Sundays**: Full volume backup with brief downtime (keeps 2 weeks of full backups)
+- **Monday-Saturday**: Online database dumps without downtime (keeps 7 days of incremental backups)
+
+All backup operations are logged with timestamps:
+- Volume backups: `./backups/db-backup-standalone.log`
+- Database dumps: `./mongo-backup/db-dump-db-standalone.log`
+- Restore operations: `./mongo-backup/db-restore-from-dump.log`
+
+## Backup Directories
+
+- `./backups/` - Volume backup archives (full mongo-volume directory)
+- `./mongo-backup/` - Database dump archives (utility-bills database only)
+
+Both directories are excluded from git via `.gitignore`.
+
 # Deploying
 The deployment is done via Docker:
 * build docker image