backup/entrypoint.sh

@@ -1,62 +1,26 @@
 #!/bin/sh
-# Runs backup_db.sh at each time in BACKUP_TIMES_UTC (comma-separated HH:MM list).
-# Defaults: 02:30, 08:30, 14:30, 20:30 UTC — four backups per day.
-#
-# Back-compat: if BACKUP_TIMES_UTC is unset but legacy BACKUP_HOUR/BACKUP_MINUTE are,
-# those are honored as a single slot.
+# Loops forever: sleeps until the next BACKUP_HOUR:BACKUP_MINUTE UTC, then runs backup_db.sh.
+# Defaults: 02:30 UTC nightly.
 
 set -eu
 
-if [ -n "${BACKUP_TIMES_UTC:-}" ]; then
-  TIMES="$BACKUP_TIMES_UTC"
-elif [ -n "${BACKUP_HOUR:-}" ] || [ -n "${BACKUP_MINUTE:-}" ]; then
-  TIMES="$(printf '%02d:%02d' "${BACKUP_HOUR:-2}" "${BACKUP_MINUTE:-30}")"
-else
-  TIMES="02:30,08:30,14:30,20:30"
-fi
-
-echo "[$(date -u +%FT%TZ)] backup schedule (UTC): ${TIMES}"
+HOUR="${BACKUP_HOUR:-2}"
+MINUTE="${BACKUP_MINUTE:-30}"
 
 if [ "${BACKUP_RUN_ON_START:-0}" = "1" ]; then
   echo "[$(date -u +%FT%TZ)] BACKUP_RUN_ON_START=1 — running backup immediately"
   /app/backup_db.sh || echo "[$(date -u +%FT%TZ)] initial backup failed (continuing)"
 fi
 
-# Compute epoch for "today HH:MM UTC" on both GNU and BSD date.
-slot_to_epoch_today() {
-  HM="$1"
-  date -u -d "today ${HM}:00" +%s 2>/dev/null \
-    || date -u -j -f "%H:%M:%S" "${HM}:00" +%s
-}
-
 while true; do
   NOW_EPOCH=$(date -u +%s)
-  NEXT=""
-  # Find the smallest TARGET > NOW across all configured slots (rolling to tomorrow if needed).
-  OLDIFS="$IFS"
-  IFS=','
-  for HM in $TIMES; do
-    HM="$(echo "$HM" | tr -d ' ')"
-    [ -z "$HM" ] && continue
-    T=$(slot_to_epoch_today "$HM")
-    if [ "$T" -le "$NOW_EPOCH" ]; then
-      T=$((T + 86400))
-    fi
-    if [ -z "$NEXT" ] || [ "$T" -lt "$NEXT" ]; then
-      NEXT="$T"
-    fi
-  done
-  IFS="$OLDIFS"
-
-  if [ -z "$NEXT" ]; then
-    echo "[$(date -u +%FT%TZ)] no valid times in BACKUP_TIMES_UTC='${TIMES}'; sleeping 1h"
-    sleep 3600
-    continue
+  TARGET=$(date -u -d "today ${HOUR}:${MINUTE}:00" +%s 2>/dev/null \
+           || date -u -j -f "%H:%M:%S" "${HOUR}:${MINUTE}:00" +%s)
+  if [ "$TARGET" -le "$NOW_EPOCH" ]; then
+    TARGET=$((TARGET + 86400))
   fi
-
-  SLEEP=$((NEXT - NOW_EPOCH))
-  NEXT_ISO=$(date -u -d "@${NEXT}" +%FT%TZ 2>/dev/null || date -u -r "${NEXT}" +%FT%TZ)
-  echo "[$(date -u +%FT%TZ)] next backup in ${SLEEP}s (at ${NEXT_ISO})"
+  SLEEP=$((TARGET - NOW_EPOCH))
+  echo "[$(date -u +%FT%TZ)] next backup in ${SLEEP}s (at $(date -u -d "@${TARGET}" +%FT%TZ 2>/dev/null || date -u -r "${TARGET}" +%FT%TZ))"
   sleep "$SLEEP"
-  /app/backup_db.sh || echo "[$(date -u +%FT%TZ)] backup failed (will retry at next slot)"
+  /app/backup_db.sh || echo "[$(date -u +%FT%TZ)] backup failed (will retry tomorrow)"
 done

docker-compose.yaml

@@ -6,13 +6,10 @@ services:
       - POSTGRES_DB=${POSTGRES_DB}
       - POSTGRES_USER=${POSTGRES_USER}
       - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
-      # HA image's PGDATA is /home/postgres/pgdata/data, not /var/lib/postgresql/data.
-      # Mount the named volume there so data survives container rebuilds.
-      - PGDATA=/home/postgres/pgdata/data
     ports:
       - "5433:5432"
     volumes:
-      - timescale-data:/home/postgres/pgdata
+      - timescale-data:/var/lib/postgresql/data
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER} -d ${POSTGRES_DB}"]
       interval: 10s
@@ -89,9 +86,9 @@ services:
         condition: service_healthy
     env_file: .env
     environment:
-      # pg_dump → rustfs. Credentials from .env (RUSTFS_*).
-      # BACKUP_TIMES_UTC: comma-separated HH:MM list. Default: 4×/day.
-      - BACKUP_TIMES_UTC=${BACKUP_TIMES_UTC:-02:30,08:30,14:30,20:30}
+      # Nightly pg_dump → rustfs. Credentials from .env (RUSTFS_*).
+      - BACKUP_HOUR=${BACKUP_HOUR:-2}
+      - BACKUP_MINUTE=${BACKUP_MINUTE:-30}
       - BACKUP_KEEP_DAYS=${BACKUP_KEEP_DAYS:-30}
       - BACKUP_RUN_ON_START=${BACKUP_RUN_ON_START:-0}
       - RUSTFS_ENDPOINT=${RUSTFS_ENDPOINT}