chore: add a 2.9.1 upgrade check for postgres and mysql

scripts/upgrade-check.sh

@@ -0,0 +1,84 @@
+#!/usr/bin/env bash
+# Upgrades a 2.9.1 database to this tree on real Postgres and MySQL servers,
+# then runs the dialect-aware backend tests against both.
+#
+# Needs Docker and the 2.9.1 tag (git fetch --tags). Run from anywhere:
+#   bash scripts/upgrade-check.sh            # both engines
+#   bash scripts/upgrade-check.sh mysql      # one engine
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+TAG="release-2.9.1-tag"
+PG="termix-upgrade-check-pg"
+MY="termix-upgrade-check-mysql"
+if [ "$#" -gt 0 ]; then
+  DIALECTS=("$@")
+else
+  DIALECTS=(postgres mysql)
+fi
+
+cd "$ROOT"
+
+if ! git rev-parse -q --verify "refs/tags/$TAG" >/dev/null; then
+  echo "Tag $TAG is missing. Run git fetch --tags first." >&2
+  exit 1
+fi
+
+WORK="$(mktemp -d)"
+cleanup() {
+  docker rm -f "$PG" "$MY" >/dev/null 2>&1 || true
+  rm -rf "$WORK"
+}
+trap cleanup EXIT
+
+git archive "$TAG" drizzle | tar -x -C "$WORK"
+mkdir -p "$WORK/data"
+
+docker rm -f "$PG" "$MY" >/dev/null 2>&1 || true
+docker run -d --name "$PG" -e POSTGRES_USER=termix -e POSTGRES_PASSWORD=termix \
+  -e POSTGRES_DB=termix -p 55433:5432 postgres:16 >/dev/null
+docker run -d --name "$MY" -e MYSQL_ROOT_PASSWORD=termix -e MYSQL_DATABASE=termix \
+  -p 33307:3306 mysql:8 >/dev/null
+
+wait_for() {
+  for _ in $(seq 1 60); do
+    if "$@" >/dev/null 2>&1; then return 0; fi
+    sleep 2
+  done
+  echo "Timed out waiting for: $*" >&2
+  exit 1
+}
+wait_for docker exec "$PG" pg_isready -U termix -d termix
+wait_for docker exec "$MY" mysql -uroot -ptermix -e "SELECT 1"
+docker exec "$PG" psql -U termix -c "CREATE DATABASE termix_test" >/dev/null
+docker exec "$MY" mysql -uroot -ptermix -e "CREATE DATABASE termix_test" 2>/dev/null
+
+TESTS=$(grep -rl "test-support" src/backend/tests --include="*.test.ts")
+
+status=0
+for dialect in "${DIALECTS[@]}"; do
+  case "$dialect" in
+    postgres) base="postgres://termix:termix@127.0.0.1:55433" ;;
+    mysql) base="mysql://root:termix@127.0.0.1:33307" ;;
+    *)
+      echo "Unknown dialect $dialect (postgres or mysql)" >&2
+      exit 2
+      ;;
+  esac
+  echo
+  echo "== 2.9.1 to this tree on $dialect"
+  if ! DATA_DIR="$WORK/data" npx tsx scripts/upgrade-check.mjs \
+    "$dialect" "$base/termix" "$WORK/drizzle"; then
+    status=1
+  fi
+  echo
+  echo "== dialect tests on $dialect"
+  # One file at a time: they share the database and wipe it between tests.
+  # shellcheck disable=SC2086
+  if ! TEST_DIALECT="$dialect" TEST_DATABASE_URL="$base/termix_test" \
+    npx vitest run --project backend --no-file-parallelism $TESTS; then
+    status=1
+  fi
+done
+
+exit "$status"