#!/bin/bash
# ============================================================
# Hindsight 备份任务（每日 02:30 跑，cron 部署参考 crontab/）
#   - 热备份：docker exec pg_dump 落盘到 bind 挂载的 backups/
#   - 保留 7 天的 .sql.gz
# ============================================================
set -euo pipefail

BACKUP_DIR="/home/geng/hindsight/backups"
KEEP_DAYS=7
TS=$(date +%Y%m%d_%H%M%S)
FNAME="hindsight_db_${TS}.sql.gz"

mkdir -p "${BACKUP_DIR}"

docker exec hindsight-db pg_dump \
    -U hindsight_user \
    -d hindsight_db \
    --no-owner --no-privileges \
    | gzip > "${BACKUP_DIR}/${FNAME}"

# 清理超过 KEEP_DAYS 天的旧备份
find "${BACKUP_DIR}" -name "hindsight_db_*.sql.gz" -mtime +${KEEP_DAYS} -delete

echo "[backup] ok: ${FNAME} ($(du -h "${BACKUP_DIR}/${FNAME}" | cut -f1))"