fix zero handling

2026-06-18 18:39:26 +01:00
parent 242820f9d1
commit 7254719794
3 changed files with 90 additions and 0 deletions
@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+usage() {
+  cat <<'USAGE'
+Usage: scripts/remove_zero_readings.sh [--dry-run] [--yes]
+
+Removes readings where temperature, humidity, and battery are all zero.
+
+Options:
+  --dry-run   Count matching readings without deleting them.
+  --yes       Delete without prompting.
+  --help      Show this help.
+USAGE
+}
+
+dry_run=0
+assume_yes=0
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --dry-run)
+      dry_run=1
+      ;;
+    --yes|-y)
+      assume_yes=1
+      ;;
+    --help|-h)
+      usage
+      exit 0
+      ;;
+    *)
+      echo "Unknown option: $1" >&2
+      usage >&2
+      exit 2
+      ;;
+  esac
+  shift
+done
+
+where_clause="temperature = 0 AND humidity = 0 AND battery = 0"
+
+run_mysql() {
+  docker compose exec -T db sh -c 'MYSQL_PWD="$MYSQL_PASSWORD" exec mysql -u"$MYSQL_USER" "$MYSQL_DATABASE" "$@"' sh "$@"
+}
+
+matching_count=$(
+  printf 'SELECT COUNT(*) FROM readings WHERE %s;\n' "$where_clause" | run_mysql --batch --skip-column-names
+)
+
+echo "Found ${matching_count} all-zero reading(s)."
+
+if [[ "$dry_run" -eq 1 || "$matching_count" -eq 0 ]]; then
+  exit 0
+fi
+
+if [[ "$assume_yes" -ne 1 ]]; then
+  read -r -p "Delete these readings? Type 'yes' to continue: " answer
+  if [[ "$answer" != "yes" ]]; then
+    echo "No records deleted."
+    exit 0
+  fi
+fi
+
+printf 'DELETE FROM readings WHERE %s;\nSELECT ROW_COUNT();\n' "$where_clause" |
+  run_mysql --batch --skip-column-names |
+  tail -n 1 |
+  xargs printf 'Deleted %s all-zero reading(s).\n'