diff --git a/models/ddl.sql b/models/ddl.sql
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+++ b/models/ddl.sql
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+-- 企业表
+CREATE TABLE orgs (
+    orgid VARCHAR(32) PRIMARY KEY COMMENT '企业ID（主键）',
+    name VARCHAR(255) NOT NULL COMMENT '企业名称',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间'
+) COMMENT='企业表';
+
+-- 流程定义表
+CREATE TABLE flow_definitions (
+    id VARCHAR(32) PRIMARY KEY COMMENT '流程定义ID',
+    orgid VARCHAR(32) NOT NULL COMMENT '企业ID',
+    code VARCHAR(100) NOT NULL COMMENT '流程编码（企业内唯一）',
+    name VARCHAR(255) NOT NULL COMMENT '流程名称',
+    version INT NOT NULL DEFAULT 1 COMMENT '流程版本',
+    description TEXT COMMENT '流程描述',
+    status TINYINT NOT NULL DEFAULT 1 COMMENT '流程状态：1=启用 0=停用',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+    UNIQUE KEY uk_org_code_version (orgid, code, version)
+) COMMENT='流程定义表';
+
+-- 流程节点定义表（增加子流程字段）
+CREATE TABLE flow_nodes (
+    id VARCHAR(32) PRIMARY KEY COMMENT '节点ID',
+    orgid VARCHAR(32) NOT NULL COMMENT '企业ID',
+    flow_definition_id VARCHAR(32) NOT NULL COMMENT '所属流程定义ID',
+    node_key VARCHAR(100) NOT NULL COMMENT '节点唯一标识（流程内唯一）',
+    name VARCHAR(255) NOT NULL COMMENT '节点名称',
+    type ENUM('start','task','gateway','subflow','end') NOT NULL COMMENT '节点类型',
+    role_id VARCHAR(32) COMMENT '节点分配角色ID',
+    assignment_type VARCHAR(50) COMMENT '任务分配类型（轮询/抢占/自动）',
+    properties JSON COMMENT '节点属性（JSON格式，自定义扩展）',
+    subflow_definition_id VARCHAR(32) COMMENT '子流程定义ID（type=subflow时使用）',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+    UNIQUE(flow_definition_id, node_key),
+    FOREIGN KEY(flow_definition_id) REFERENCES flow_definitions(id) ON DELETE CASCADE,
+    FOREIGN KEY(subflow_definition_id) REFERENCES flow_definitions(id)
+) COMMENT='流程节点定义表';
+
+-- 节点转移表
+CREATE TABLE flow_transitions (
+    id VARCHAR(32) PRIMARY KEY COMMENT '节点转移ID',
+    orgid VARCHAR(32) NOT NULL COMMENT '企业ID',
+    flow_definition_id VARCHAR(32) NOT NULL COMMENT '所属流程定义ID',
+    source_node_id VARCHAR(32) NOT NULL COMMENT '起始节点ID',
+    target_node_id VARCHAR(32) NOT NULL COMMENT '目标节点ID',
+    condition_expr VARCHAR(1000) COMMENT '转移条件表达式',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+    FOREIGN KEY(source_node_id) REFERENCES flow_nodes(id),
+    FOREIGN KEY(target_node_id) REFERENCES flow_nodes(id)
+) COMMENT='流程节点转移表';
+
+-- 节点表单表
+CREATE TABLE flow_node_forms (
+    id VARCHAR(32) PRIMARY KEY COMMENT '节点表单ID',
+    orgid VARCHAR(32) NOT NULL COMMENT '企业ID',
+    flow_node_id VARCHAR(32) NOT NULL COMMENT '节点ID',
+    schema JSON NOT NULL COMMENT '表单结构定义（JSON/JIO）',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+    FOREIGN KEY(flow_node_id) REFERENCES flow_nodes(id)
+) COMMENT='节点表单定义表';
+
+-- 流程实例表
+CREATE TABLE flow_instances (
+    id VARCHAR(32) PRIMARY KEY COMMENT '流程实例ID',
+    orgid VARCHAR(32) NOT NULL COMMENT '企业ID',
+    flow_definition_id VARCHAR(32) NOT NULL COMMENT '流程定义ID',
+    version INT NOT NULL COMMENT '流程版本',
+    status ENUM('running','completed','terminated') DEFAULT 'running' COMMENT '实例状态',
+    context JSON COMMENT '运行时上下文数据',
+    created_by VARCHAR(32) NOT NULL COMMENT '发起人用户ID',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+    FOREIGN KEY(flow_definition_id) REFERENCES flow_definitions(id)
+) COMMENT='流程实例表';
+
+-- 流程实例节点表（增加 parent_instance_node_id 支持子流程嵌套）
+CREATE TABLE flow_instance_nodes (
+    id VARCHAR(32) PRIMARY KEY COMMENT '流程实例节点ID',
+    orgid VARCHAR(32) NOT NULL COMMENT '企业ID',
+    flow_instance_id VARCHAR(32) NOT NULL COMMENT '流程实例ID',
+    flow_node_id VARCHAR(32) NOT NULL COMMENT '流程节点ID',
+    parent_instance_node_id VARCHAR(32) COMMENT '父节点实例ID（子流程时使用）',
+    status ENUM('pending','in_progress','completed','skipped') DEFAULT 'pending' COMMENT '节点实例状态',
+    assigned_to VARCHAR(32) COMMENT '指派用户ID（当前）',
+    form_data JSON COMMENT '填写的表单数据',
+    started_at TIMESTAMP COMMENT '节点开始时间',
+    completed_at TIMESTAMP COMMENT '节点完成时间',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+    FOREIGN KEY(flow_instance_id) REFERENCES flow_instances(id),
+    FOREIGN KEY(flow_node_id) REFERENCES flow_nodes(id),
+    FOREIGN KEY(parent_instance_node_id) REFERENCES flow_instance_nodes(id)
+) COMMENT='流程实例节点表';
+
+-- 节点任务表（人工任务）
+CREATE TABLE flow_tasks (
+    id VARCHAR(32) PRIMARY KEY COMMENT '任务ID',
+    orgid VARCHAR(32) NOT NULL COMMENT '企业ID',
+    instance_node_id VARCHAR(32) NOT NULL COMMENT '流程实例节点ID',
+    assignee_id VARCHAR(32) COMMENT '指派用户ID（原始）',
+    candidate_role VARCHAR(128) COMMENT '候选角色',
+    status ENUM('pending','claimed','completed','failed') DEFAULT 'pending' COMMENT '任务状态',
+    input JSON COMMENT '任务输入数据',
+    output JSON COMMENT '任务输出数据',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+    FOREIGN KEY(instance_node_id) REFERENCES flow_instance_nodes(id)
+) COMMENT='节点任务表';
+
+-- 用户代理表（请假/任务委托）
+CREATE TABLE user_delegations (
+    id VARCHAR(32) PRIMARY KEY COMMENT '委托ID',
+    orgid VARCHAR(32) NOT NULL COMMENT '企业ID',
+    user_id VARCHAR(32) NOT NULL COMMENT '原始任务用户ID',
+    delegate_id VARCHAR(32) NOT NULL COMMENT '代理用户ID',
+    start_time DATETIME NOT NULL COMMENT '生效开始时间',
+    end_time DATETIME NOT NULL COMMENT '生效结束时间',
+    status TINYINT DEFAULT 1 COMMENT '状态：1=生效 0=停用',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间'
+) COMMENT='用户代理表';
+
+-- 流程日志表
+CREATE TABLE flow_logs (
+    id VARCHAR(32) PRIMARY KEY COMMENT '日志ID',
+    orgid VARCHAR(32) NOT NULL COMMENT '企业ID',
+    flow_instance_id VARCHAR(32) NOT NULL COMMENT '流程实例ID',
+    flow_node_id VARCHAR(32) COMMENT '节点ID（可为空）',
+    parent_instance_node_id VARCHAR(32) COMMENT '父节点实例ID（子流程时使用）',
+    action VARCHAR(100) NOT NULL COMMENT '操作动作（start, complete, assign, transition, terminate）',
+    operator_id VARCHAR(32) COMMENT '操作人用户ID',
+    original_assignee_id VARCHAR(32) COMMENT '原始任务指派人（代理场景使用）',
+    message TEXT COMMENT '日志内容',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+    FOREIGN KEY(flow_instance_id) REFERENCES flow_instances(id),
+    FOREIGN KEY(flow_node_id) REFERENCES flow_nodes(id),
+    FOREIGN KEY(parent_instance_node_id) REFERENCES flow_instance_nodes(id)
+) COMMENT='流程日志表';
+
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