第一次提交

backend/migrations/create_data_sources_table.sql

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+-- 创建数据源表
+CREATE TABLE IF NOT EXISTS data_sources (
+    id CHAR(36) PRIMARY KEY COMMENT '数据源ID',
+    name VARCHAR(100) NOT NULL COMMENT '数据源名称',
+    type VARCHAR(50) NOT NULL COMMENT '数据源类型: mysql/postgresql/mongodb/redis/csv/json/api/s3',
+    description TEXT COMMENT '描述',
+    config JSON NOT NULL COMMENT '连接配置（加密存储敏感信息）',
+    status VARCHAR(20) DEFAULT 'active' COMMENT '状态: active/inactive/error',
+    user_id CHAR(36) NOT NULL COMMENT '创建者ID',
+    last_connected_at DATETIME COMMENT '最后连接时间',
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
+    INDEX idx_user_id (user_id),
+    INDEX idx_type (type),
+    INDEX idx_status (status)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='数据源表';

backend/migrations/create_execution_logs_table.sql

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+-- 创建执行日志表
+CREATE TABLE IF NOT EXISTS execution_logs (
+    id CHAR(36) PRIMARY KEY COMMENT '日志ID',
+    execution_id CHAR(36) NOT NULL COMMENT '执行ID',
+    node_id VARCHAR(100) COMMENT '节点ID',
+    node_type VARCHAR(50) COMMENT '节点类型',
+    level VARCHAR(20) NOT NULL COMMENT '日志级别: INFO/WARN/ERROR/DEBUG',
+    message TEXT NOT NULL COMMENT '日志消息',
+    data JSON COMMENT '附加数据',
+    timestamp DATETIME DEFAULT CURRENT_TIMESTAMP COMMENT '时间戳',
+    duration INT COMMENT '执行耗时(ms)',
+    FOREIGN KEY (execution_id) REFERENCES executions(id) ON DELETE CASCADE,
+    INDEX idx_execution_id (execution_id),
+    INDEX idx_node_id (node_id),
+    INDEX idx_level (level),
+    INDEX idx_timestamp (timestamp)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='执行日志表';

backend/migrations/create_workflow_versions_table.sql

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+-- 创建工作流版本表
+CREATE TABLE IF NOT EXISTS workflow_versions (
+    id CHAR(36) PRIMARY KEY COMMENT '版本ID',
+    workflow_id CHAR(36) NOT NULL COMMENT '工作流ID',
+    version INT NOT NULL COMMENT '版本号',
+    name VARCHAR(100) NOT NULL COMMENT '工作流名称',
+    description TEXT COMMENT '描述',
+    nodes JSON NOT NULL COMMENT '节点配置',
+    edges JSON NOT NULL COMMENT '边配置',
+    status VARCHAR(20) DEFAULT 'draft' COMMENT '状态: draft/published/running/stopped',
+    created_by CHAR(36) COMMENT '创建者ID',
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+    comment TEXT COMMENT '版本备注',
+    FOREIGN KEY (workflow_id) REFERENCES workflows(id) ON DELETE CASCADE,
+    FOREIGN KEY (created_by) REFERENCES users(id) ON DELETE SET NULL,
+    INDEX idx_workflow_id (workflow_id),
+    INDEX idx_version (workflow_id, version)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='工作流版本表';