feat(oa): add oa_instance_comment table and model

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/models/models.py

@@ -982,6 +982,28 @@ class OaInstanceEvent(Base):
     del_flag = Column(SmallInteger, nullable=False, default=0, comment="删除标记")
 
 
+class OaInstanceComment(Base):
+    """OA审批实例评论 oa_instance_comment"""
+
+    __tablename__ = "oa_instance_comment"
+
+    id = Column(String(64), primary_key=True, comment="主键ID")
+    instance_id = Column(String(64), nullable=False, comment="所属实例ID")
+    content = Column(String(1024), nullable=False, comment="评论正文")
+    attachment_refs_json = Column(Text, nullable=True, comment="引用表单附件快照 JSON")
+    status = Column(String(16), nullable=False, default="normal", comment="normal/revoked")
+    revoked_time = Column(DateTime, nullable=True, comment="撤回时间")
+    tenant_no = Column(String(64), nullable=False, default="zkxw", comment="租户编号")
+    order_num = Column(Integer, nullable=True, comment="排序号")
+    remark = Column(String(512), nullable=True, comment="备注")
+    create_by = Column(String(64), nullable=True, comment="创建人id（评论作者）")
+    create_dept_id = Column(String(64), nullable=False, default="", comment="创建人部门ID")
+    create_time = Column(DateTime, nullable=False, default=datetime.now, comment="创建时间")
+    update_by = Column(String(64), nullable=True, comment="更新人id")
+    update_time = Column(DateTime, nullable=False, default=datetime.now, onupdate=datetime.now, comment="更新时间")
+    del_flag = Column(SmallInteger, nullable=False, default=0, comment="删除标记")
+
+
 class OaRelation(Base):
     """OA关联审批 oa_relation"""
 

docs/sql/migrations/2026-09-20-oa-instance-comment.sql

@@ -0,0 +1,20 @@
+-- OA 审批实例评论
+CREATE TABLE IF NOT EXISTS `oa_instance_comment` (
+  `id` varchar(64) COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '主键ID',
+  `instance_id` varchar(64) COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '所属实例ID',
+  `content` varchar(1024) COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '评论正文',
+  `attachment_refs_json` text COLLATE utf8mb4_unicode_ci COMMENT '引用表单附件快照 JSON',
+  `status` varchar(16) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT 'normal' COMMENT 'normal/revoked',
+  `revoked_time` datetime DEFAULT NULL COMMENT '撤回时间',
+  `tenant_no` varchar(64) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT 'zkxw' COMMENT '租户编号',
+  `order_num` int(11) DEFAULT NULL COMMENT '排序号',
+  `remark` varchar(512) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '备注',
+  `create_by` varchar(64) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '创建人id（评论作者）',
+  `create_dept_id` varchar(64) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '' COMMENT '创建人部门ID',
+  `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+  `update_by` varchar(64) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '更新人id',
+  `update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+  `del_flag` smallint(6) NOT NULL DEFAULT '0' COMMENT '删除标记',
+  PRIMARY KEY (`id`),
+  KEY `idx_oa_comment_tenant_inst_time` (`tenant_no`,`instance_id`,`create_time`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='OA审批实例评论';