feat: add database migration helper script

migrate.sh

@@ -0,0 +1,82 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# 从 .env 加载环境变量
+if [[ -f .env ]]; then
+    echo "Loading DATABASE_URL from .env..."
+    # shellcheck source=/dev/null
+    set -a
+    source .env
+    set +a
+fi
+
+# 检查 DATABASE_URL
+if [[ -z "${DATABASE_URL:-}" ]]; then
+    echo "ERROR: DATABASE_URL is not set."
+    echo "Please create a .env file or set the DATABASE_URL environment variable."
+    echo "Example: export DATABASE_URL=postgres://postgres:postgres@localhost:5432/yggdrasil"
+    exit 1
+fi
+
+echo "Using database: $DATABASE_URL"
+
+# 从 DATABASE_URL 中提取数据库名
+DB_NAME=$(echo "$DATABASE_URL" | sed -n 's/.*\/\([^?]*\).*/\1/p')
+# 提取不带数据库名的连接字符串（用于连接 postgres 系统库）
+ADMIN_URL=$(echo "$DATABASE_URL" | sed "s|/${DB_NAME}|/postgres|")
+
+echo "Target database: $DB_NAME"
+
+# 检查目标数据库是否存在，不存在则创建
+echo "Checking if database '$DB_NAME' exists..."
+if ! psql "$ADMIN_URL" -tAc "SELECT 1 FROM pg_database WHERE datname='${DB_NAME}';" | grep -q 1; then
+    echo "Database '$DB_NAME' does not exist. Creating..."
+    psql "$ADMIN_URL" -c "CREATE DATABASE ${DB_NAME};"
+    echo "Database '$DB_NAME' created."
+else
+    echo "Database '$DB_NAME' already exists."
+fi
+
+# 按顺序执行所有迁移文件
+MIGRATIONS_DIR="migrations"
+
+if [[ ! -d "$MIGRATIONS_DIR" ]]; then
+    echo "ERROR: Migrations directory '$MIGRATIONS_DIR' not found."
+    exit 1
+fi
+
+# 获取排序后的 SQL 文件列表
+MIGRATION_FILES=""
+for f in "$MIGRATIONS_DIR"/*.sql; do
+    [[ -f "$f" ]] && MIGRATION_FILES="$MIGRATION_FILES$f
+"
+done
+
+if [[ -z "$MIGRATION_FILES" ]]; then
+    echo "No migration files found in $MIGRATIONS_DIR."
+    exit 0
+fi
+
+echo ""
+echo "Running migrations..."
+echo "====================="
+
+echo "$MIGRATION_FILES" | sort | while IFS= read -r file; do
+    [[ -z "$file" ]] && continue
+    filename=$(basename "$file")
+    echo -n "[$filename] ... "
+
+    if psql "$DATABASE_URL" -f "$file" > /dev/null 2>&1; then
+        echo "OK"
+    else
+        echo "SKIPPED (already applied or error)"
+    fi
+done
+
+echo "====================="
+echo "Migration complete!"
+echo ""
+
+# 显示当前数据库中的表
+echo "Tables in database '$DB_NAME':"
+psql "$DATABASE_URL" -c "\dt" || true