chore: add runtime reindexing script

scripts/db/ensure_indexes.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+CONTAINER="db"
+DB_USER="postgres"
+DB_NAME="postgres"
+
+if ! docker inspect --format='{{.State.Running}}' "$CONTAINER" 2>/dev/null | grep -q true; then
+  echo "ERROR: container '$CONTAINER' is not running" >&2
+  exit 1
+fi
+
+echo "Ensuring indexes on '$DB_NAME' in container '$CONTAINER'..."
+
+docker exec -i "$CONTAINER" psql -U "$DB_USER" -d "$DB_NAME" <<'SQL'
+\set ON_ERROR_STOP on
+
+CREATE INDEX IF NOT EXISTS idx_gateways_mac          ON gateways(mac);
+CREATE INDEX IF NOT EXISTS idx_tracker_zones_tracker ON tracker_zones(tracker);
+CREATE INDEX IF NOT EXISTS idx_tracks_gateway        ON tracks(gateway);
+CREATE INDEX IF NOT EXISTS idx_tracks_tracker        ON tracks(tracker);
+CREATE INDEX IF NOT EXISTS idx_tracks_uuid_ts        ON tracks(uuid, timestamp);
+CREATE INDEX IF NOT EXISTS idx_tracks_tracker_ts     ON tracks(tracker, timestamp);
+
+\echo 'Done.'
+SQL