diff --git a/backend/script/sql/aihr_candidate_material_mysql8.sql b/backend/script/sql/aihr_candidate_material_mysql8.sql
index e88e43d6..e08fc8fa 100644
--- a/backend/script/sql/aihr_candidate_material_mysql8.sql
+++ b/backend/script/sql/aihr_candidate_material_mysql8.sql
@@ -2,7 +2,7 @@
 
 CREATE TABLE IF NOT EXISTS `aihr_candidate_material` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `candidate_id` varchar(80) NOT NULL COMMENT '候选人外部ID',
   `candidate_name` varchar(100) DEFAULT NULL COMMENT '候选人姓名',
   `material_type` varchar(50) DEFAULT NULL COMMENT '资料类型',
diff --git a/backend/script/sql/aihr_interview_result_mysql8.sql b/backend/script/sql/aihr_interview_result_mysql8.sql
index 68bd77f8..5ebe4a72 100644
--- a/backend/script/sql/aihr_interview_result_mysql8.sql
+++ b/backend/script/sql/aihr_interview_result_mysql8.sql
@@ -3,7 +3,7 @@
 
 CREATE TABLE IF NOT EXISTS `aihr_interview_result` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `session_id` varchar(100) NOT NULL COMMENT '面试会话ID',
   `candidate_id` varchar(80) DEFAULT NULL COMMENT '候选人ID',
   `candidate_name` varchar(100) DEFAULT NULL COMMENT '候选人姓名',
@@ -33,7 +33,7 @@ CREATE TABLE IF NOT EXISTS `aihr_interview_result` (
 
 CREATE TABLE IF NOT EXISTS `aihr_candidate_employee_link` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `candidate_id` varchar(80) NOT NULL COMMENT '本地候选人ID',
   `ext_party_id` varchar(100) NOT NULL COMMENT '外部员工主体ID',
   `status` varchar(20) DEFAULT '已关联' COMMENT '关联状态',
diff --git a/backend/script/sql/aihr_knowledge_mysql8.sql b/backend/script/sql/aihr_knowledge_mysql8.sql
index c70a0c8b..13ec65ce 100644
--- a/backend/script/sql/aihr_knowledge_mysql8.sql
+++ b/backend/script/sql/aihr_knowledge_mysql8.sql
@@ -3,7 +3,7 @@
 
 CREATE TABLE IF NOT EXISTS `aihr_knowledge_info` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `name` varchar(100) NOT NULL COMMENT '知识库名称',
   `code` varchar(100) DEFAULT NULL COMMENT '租户内稳定空间编码；平台迁移会回填 legacy 编码并改为必填',
   `space_type` varchar(30) NOT NULL DEFAULT 'BUSINESS' COMMENT 'PUBLIC/BUSINESS/MANAGEMENT/EXTERNAL',
@@ -33,7 +33,7 @@ CREATE TABLE IF NOT EXISTS `aihr_knowledge_info` (
 
 CREATE TABLE IF NOT EXISTS `aihr_knowledge_attach` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `knowledge_id` bigint NOT NULL COMMENT '知识库ID',
   `oss_id` bigint DEFAULT NULL COMMENT '对象存储ID',
   `doc_id` varchar(32) DEFAULT NULL COMMENT '文档ID',
@@ -53,7 +53,7 @@ CREATE TABLE IF NOT EXISTS `aihr_knowledge_attach` (
 
 CREATE TABLE IF NOT EXISTS `aihr_knowledge_fragment` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `knowledge_id` bigint NOT NULL COMMENT '知识库ID',
   `idx` int NOT NULL COMMENT '片段序号',
   `doc_id` varchar(32) DEFAULT NULL COMMENT '文档ID',
@@ -75,7 +75,7 @@ CREATE TABLE IF NOT EXISTS `aihr_knowledge_fragment` (
 
 CREATE TABLE IF NOT EXISTS `aihr_knowledge_import_task` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `directory` varchar(500) NOT NULL COMMENT '导入相对目录',
   `category` varchar(100) NOT NULL COMMENT '知识库分类',
   `status` tinyint DEFAULT 0 COMMENT '任务状态: 0等待, 1运行中, 2完成, 3失败, 4取消',
@@ -143,7 +143,7 @@ ON DUPLICATE KEY UPDATE
 -- 知识库批量上传队列：上传秒回后由后台 worker 加工，支持单文件重试
 CREATE TABLE IF NOT EXISTS `aihr_knowledge_upload_item` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `batch_id` varchar(64) NOT NULL COMMENT '上传批次',
   `file_name` varchar(255) NOT NULL COMMENT '文件名',
   `category` varchar(100) DEFAULT '' COMMENT '目标分类',
diff --git a/backend/script/sql/aihr_model_mysql8.sql b/backend/script/sql/aihr_model_mysql8.sql
index 43bec1c2..02efecbe 100644
--- a/backend/script/sql/aihr_model_mysql8.sql
+++ b/backend/script/sql/aihr_model_mysql8.sql
@@ -3,7 +3,7 @@
 
 CREATE TABLE IF NOT EXISTS `aihr_model_provider` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `provider_name` varchar(100) NOT NULL COMMENT '供应商名称',
   `provider_code` varchar(50) NOT NULL COMMENT '供应商编码',
   `provider_desc` varchar(500) DEFAULT NULL COMMENT '供应商描述',
@@ -24,7 +24,7 @@ CREATE TABLE IF NOT EXISTS `aihr_model_provider` (
 
 CREATE TABLE IF NOT EXISTS `aihr_model_config` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `category` varchar(30) NOT NULL COMMENT '模型类型: chat/vector/rerank',
   `model_name` varchar(100) NOT NULL COMMENT '模型名称',
   `provider_code` varchar(50) NOT NULL COMMENT '供应商编码',
diff --git a/backend/script/sql/aihr_org_snapshot_mysql8.sql b/backend/script/sql/aihr_org_snapshot_mysql8.sql
index fa0bf249..1f8d301e 100644
--- a/backend/script/sql/aihr_org_snapshot_mysql8.sql
+++ b/backend/script/sql/aihr_org_snapshot_mysql8.sql
@@ -6,7 +6,7 @@
 DROP TABLE IF EXISTS `aihr_org_snapshot`;
 CREATE TABLE `aihr_org_snapshot` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `project_code` varchar(50) NOT NULL COMMENT '项目编码（数据权限范围主体，D1）',
   `project_name` varchar(100) NOT NULL COMMENT '项目名称',
   `dept_name` varchar(100) DEFAULT NULL COMMENT '部门/条线',
diff --git a/backend/script/sql/aihr_practice_mysql8.sql b/backend/script/sql/aihr_practice_mysql8.sql
index cad3ca68..99671e26 100644
--- a/backend/script/sql/aihr_practice_mysql8.sql
+++ b/backend/script/sql/aihr_practice_mysql8.sql
@@ -3,7 +3,7 @@
 
 CREATE TABLE IF NOT EXISTS `aihr_case_record` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `case_id` varchar(80) NOT NULL COMMENT '案例ID',
   `file_name` varchar(255) DEFAULT NULL COMMENT '来源文件',
   `project_ext_org_id` varchar(100) DEFAULT NULL COMMENT '项目外部组织ID',
@@ -26,7 +26,7 @@ CREATE TABLE IF NOT EXISTS `aihr_case_record` (
 
 CREATE TABLE IF NOT EXISTS `aihr_practice_session` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `session_id` varchar(100) NOT NULL COMMENT '训练会话ID',
   `ext_party_id` varchar(100) DEFAULT NULL COMMENT '外部主体或手机号',
   `trainee_name` varchar(100) DEFAULT NULL COMMENT '学员名称',
@@ -64,7 +64,7 @@ CREATE TABLE IF NOT EXISTS `aihr_practice_session` (
 
 CREATE TABLE IF NOT EXISTS `aihr_practice_annotation` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `session_id` varchar(100) NOT NULL COMMENT '训练会话ID',
   `turn_index` int NOT NULL COMMENT '话术序号',
   `source_text` varchar(1000) DEFAULT NULL COMMENT '原话',
@@ -80,7 +80,7 @@ CREATE TABLE IF NOT EXISTS `aihr_practice_annotation` (
 
 CREATE TABLE IF NOT EXISTS `aihr_practice_audio` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `session_id` varchar(100) NOT NULL COMMENT '训练会话ID',
   `turn_index` int NOT NULL COMMENT '话术序号',
   `role` varchar(30) NOT NULL COMMENT '音频角色',
@@ -95,7 +95,7 @@ CREATE TABLE IF NOT EXISTS `aihr_practice_audio` (
 
 CREATE TABLE IF NOT EXISTS `aihr_practice_audio_upload` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `oss_id` bigint NOT NULL COMMENT 'OSS文件ID',
   `owner_user_id` bigint NOT NULL COMMENT '上传用户ID',
   `owner_identity` varchar(100) NOT NULL COMMENT '上传主体',
@@ -111,7 +111,7 @@ CREATE TABLE IF NOT EXISTS `aihr_practice_audio_upload` (
 
 CREATE TABLE IF NOT EXISTS `aihr_practice_assignment` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `ext_party_id` varchar(100) NOT NULL COMMENT '员工外部主体或手机号',
   `trainee_name` varchar(100) DEFAULT NULL COMMENT '员工姓名',
   `scenario_id` varchar(80) NOT NULL COMMENT '场景ID',
@@ -139,7 +139,7 @@ CREATE TABLE IF NOT EXISTS `aihr_practice_assignment` (
 
 CREATE TABLE IF NOT EXISTS `aihr_practice_calibration` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `session_id` varchar(100) NOT NULL COMMENT '训练会话ID',
   `reviewer` varchar(100) DEFAULT NULL COMMENT '校准人',
   `original_score` int DEFAULT NULL COMMENT 'AI原始总分',
@@ -155,7 +155,7 @@ CREATE TABLE IF NOT EXISTS `aihr_practice_calibration` (
 
 CREATE TABLE IF NOT EXISTS `aihr_practice_scenario` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `scenario_code` varchar(80) NOT NULL COMMENT '场景编码',
   `scenario_name` varchar(100) NOT NULL COMMENT '场景名称',
   `position` varchar(80) NOT NULL COMMENT '岗位',
@@ -187,7 +187,7 @@ CREATE TABLE IF NOT EXISTS `aihr_practice_scenario` (
 
 CREATE TABLE IF NOT EXISTS `aihr_practice_rubric` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `rubric_code` varchar(100) NOT NULL COMMENT 'Rubric编码',
   `scenario_code` varchar(80) NOT NULL COMMENT '场景编码',
   `rubric_name` varchar(100) NOT NULL COMMENT 'Rubric名称',
@@ -203,7 +203,7 @@ CREATE TABLE IF NOT EXISTS `aihr_practice_rubric` (
 
 CREATE TABLE IF NOT EXISTS `aihr_practice_rubric_dimension` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `rubric_code` varchar(100) NOT NULL COMMENT 'Rubric编码',
   `dimension_code` varchar(50) NOT NULL COMMENT '维度编码',
   `dimension_name` varchar(50) NOT NULL COMMENT '维度名称',
@@ -219,7 +219,7 @@ CREATE TABLE IF NOT EXISTS `aihr_practice_rubric_dimension` (
 
 CREATE TABLE IF NOT EXISTS `aihr_prompt_template` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `code` varchar(80) NOT NULL COMMENT '模板编码',
   `name` varchar(100) NOT NULL COMMENT '模板名称',
   `category` varchar(50) NOT NULL COMMENT '业务分类',
@@ -239,7 +239,7 @@ CREATE TABLE IF NOT EXISTS `aihr_prompt_template` (
 
 CREATE TABLE IF NOT EXISTS `aihr_knowledge_gap` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `query_text` varchar(1000) NOT NULL COMMENT '未命中问题',
   `category` varchar(100) DEFAULT NULL COMMENT '知识分类',
   `position` varchar(80) DEFAULT NULL COMMENT '岗位',
@@ -252,7 +252,7 @@ CREATE TABLE IF NOT EXISTS `aihr_knowledge_gap` (
 
 CREATE TABLE IF NOT EXISTS `aihr_sop_answer_review` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `query_text` varchar(1000) NOT NULL COMMENT '问题',
   `category` varchar(100) DEFAULT NULL COMMENT '知识分类',
   `answer_text` varchar(2000) DEFAULT NULL COMMENT '回答',
@@ -274,7 +274,7 @@ CREATE TABLE IF NOT EXISTS `aihr_sop_answer_review` (
 
 CREATE TABLE IF NOT EXISTS `aihr_knowledge_answer_feedback` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `query_text` varchar(1000) NOT NULL COMMENT '问题原文',
   `query_norm` varchar(500) NOT NULL COMMENT '规范化问题',
   `fragment_id` bigint NOT NULL COMMENT '知识片段ID',
@@ -471,7 +471,7 @@ ON DUPLICATE KEY UPDATE
 -- 不写入业务数据；与 update/aihr_20260715_position_sop_qualification_mysql8.sql 保持一致。
 CREATE TABLE IF NOT EXISTS `aihr_position_responsibility` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) NOT NULL DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL DEFAULT '000000' COMMENT '租户编号',
   `position_code` varchar(80) NOT NULL COMMENT '岗位编码',
   `responsibility_text` varchar(1000) NOT NULL COMMENT '岗位职责',
   `sop_id` bigint DEFAULT NULL COMMENT '关联SOP主键（跨模块引用）',
@@ -488,7 +488,7 @@ CREATE TABLE IF NOT EXISTS `aihr_position_responsibility` (
 
 CREATE TABLE IF NOT EXISTS `aihr_sop_applicability` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) NOT NULL DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL DEFAULT '000000' COMMENT '租户编号',
   `sop_id` bigint DEFAULT NULL COMMENT '关联SOP主键（跨模块引用）',
   `sop_code` varchar(100) DEFAULT NULL COMMENT '关联SOP编码',
   `project_type` varchar(80) DEFAULT NULL COMMENT '项目类型：住宅/公建/景区等',
@@ -506,7 +506,7 @@ CREATE TABLE IF NOT EXISTS `aihr_sop_applicability` (
 
 CREATE TABLE IF NOT EXISTS `aihr_onboard_task` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) NOT NULL DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL DEFAULT '000000' COMMENT '租户编号',
   `ext_party_id` varchar(100) NOT NULL COMMENT '员工外部主体ID，不复制姓名',
   `project_code` varchar(100) DEFAULT NULL COMMENT '项目编码',
   `position_code` varchar(80) DEFAULT NULL COMMENT '岗位编码',
@@ -528,7 +528,7 @@ CREATE TABLE IF NOT EXISTS `aihr_onboard_task` (
 
 CREATE TABLE IF NOT EXISTS `aihr_qualification_gate` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) NOT NULL DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL DEFAULT '000000' COMMENT '租户编号',
   `ext_party_id` varchar(100) NOT NULL COMMENT '员工外部主体ID，不复制姓名',
   `project_code` varchar(100) DEFAULT NULL COMMENT '项目编码',
   `position_code` varchar(80) NOT NULL COMMENT '岗位编码',
diff --git a/backend/script/sql/update/aihr_20260714_practice_catalog_schema_mysql8.sql b/backend/script/sql/update/aihr_20260714_practice_catalog_schema_mysql8.sql
index 3e0d7ec3..71232239 100644
--- a/backend/script/sql/update/aihr_20260714_practice_catalog_schema_mysql8.sql
+++ b/backend/script/sql/update/aihr_20260714_practice_catalog_schema_mysql8.sql
@@ -3,7 +3,7 @@
 
 CREATE TABLE IF NOT EXISTS `aihr_practice_scenario` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `scenario_code` varchar(80) NOT NULL COMMENT '场景编码',
   `scenario_name` varchar(100) NOT NULL COMMENT '场景名称',
   `position` varchar(80) NOT NULL COMMENT '岗位',
@@ -35,7 +35,7 @@ CREATE TABLE IF NOT EXISTS `aihr_practice_scenario` (
 
 CREATE TABLE IF NOT EXISTS `aihr_practice_rubric` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `rubric_code` varchar(100) NOT NULL COMMENT 'Rubric编码',
   `scenario_code` varchar(80) NOT NULL COMMENT '场景编码',
   `rubric_name` varchar(100) NOT NULL COMMENT 'Rubric名称',
@@ -51,7 +51,7 @@ CREATE TABLE IF NOT EXISTS `aihr_practice_rubric` (
 
 CREATE TABLE IF NOT EXISTS `aihr_practice_rubric_dimension` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `rubric_code` varchar(100) NOT NULL COMMENT 'Rubric编码',
   `dimension_code` varchar(50) NOT NULL COMMENT '维度编码',
   `dimension_name` varchar(50) NOT NULL COMMENT '维度名称',
diff --git a/backend/script/sql/update/aihr_20260714_practice_evidence_mysql8.sql b/backend/script/sql/update/aihr_20260714_practice_evidence_mysql8.sql
index 4d03cfba..24af9e65 100644
--- a/backend/script/sql/update/aihr_20260714_practice_evidence_mysql8.sql
+++ b/backend/script/sql/update/aihr_20260714_practice_evidence_mysql8.sql
@@ -3,7 +3,7 @@
 
 CREATE TABLE IF NOT EXISTS `aihr_practice_audio` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `session_id` varchar(100) NOT NULL COMMENT '训练会话ID',
   `turn_index` int NOT NULL COMMENT '话术序号',
   `role` varchar(30) NOT NULL COMMENT '音频角色',
@@ -18,7 +18,7 @@ CREATE TABLE IF NOT EXISTS `aihr_practice_audio` (
 
 CREATE TABLE IF NOT EXISTS `aihr_practice_audio_upload` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `oss_id` bigint NOT NULL COMMENT 'OSS文件ID',
   `owner_user_id` bigint NOT NULL COMMENT '上传用户ID',
   `owner_identity` varchar(100) NOT NULL COMMENT '上传主体',
@@ -34,7 +34,7 @@ CREATE TABLE IF NOT EXISTS `aihr_practice_audio_upload` (
 
 CREATE TABLE IF NOT EXISTS `aihr_practice_calibration` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `session_id` varchar(100) NOT NULL COMMENT '训练会话ID',
   `reviewer` varchar(100) DEFAULT NULL COMMENT '校准人',
   `original_score` int DEFAULT NULL COMMENT 'AI原始总分',
diff --git a/backend/script/sql/update/aihr_20260714_practice_five_dimensions_mysql8.sql b/backend/script/sql/update/aihr_20260714_practice_five_dimensions_mysql8.sql
index 5f3e3e86..9229023e 100644
--- a/backend/script/sql/update/aihr_20260714_practice_five_dimensions_mysql8.sql
+++ b/backend/script/sql/update/aihr_20260714_practice_five_dimensions_mysql8.sql
@@ -57,7 +57,7 @@ EXECUTE aihr_response_latency_stmt;
 DEALLOCATE PREPARE aihr_response_latency_stmt;
 
 CREATE TEMPORARY TABLE IF NOT EXISTS aihr_brd_rubric_codes (
-  tenant_id varchar(20) NOT NULL,
+  tenant_id varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL,
   rubric_code varchar(100) NOT NULL,
   PRIMARY KEY (tenant_id, rubric_code)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
diff --git a/backend/script/sql/update/aihr_20260715_candidate_interview_review_mysql8.sql b/backend/script/sql/update/aihr_20260715_candidate_interview_review_mysql8.sql
index 06ec6ab0..807f5dd0 100644
--- a/backend/script/sql/update/aihr_20260715_candidate_interview_review_mysql8.sql
+++ b/backend/script/sql/update/aihr_20260715_candidate_interview_review_mysql8.sql
@@ -3,7 +3,7 @@
 
 CREATE TABLE IF NOT EXISTS `aihr_candidate_material` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `candidate_id` varchar(80) NOT NULL COMMENT '候选人外部ID',
   `candidate_name` varchar(100) DEFAULT NULL COMMENT '候选人姓名',
   `material_type` varchar(50) DEFAULT NULL COMMENT '资料类型',
@@ -56,7 +56,7 @@ DEALLOCATE PREPARE aihr_candidate_material_reviewed_time_stmt;
 
 CREATE TABLE IF NOT EXISTS `aihr_interview_result` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `session_id` varchar(100) NOT NULL COMMENT '面试会话ID',
   `candidate_id` varchar(80) DEFAULT NULL COMMENT '候选人ID',
   `candidate_name` varchar(100) DEFAULT NULL COMMENT '候选人姓名',
@@ -182,7 +182,7 @@ DEALLOCATE PREPARE aihr_interview_reviewed_time_stmt;
 
 CREATE TABLE IF NOT EXISTS `aihr_candidate_employee_link` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `candidate_id` varchar(80) NOT NULL COMMENT '本地候选人ID',
   `ext_party_id` varchar(100) NOT NULL COMMENT '外部员工主体ID',
   `status` varchar(20) DEFAULT '已关联' COMMENT '关联状态',
diff --git a/backend/script/sql/update/aihr_20260715_knowledge_feedback_mysql8.sql b/backend/script/sql/update/aihr_20260715_knowledge_feedback_mysql8.sql
index 715b6fa3..d958e8bd 100644
--- a/backend/script/sql/update/aihr_20260715_knowledge_feedback_mysql8.sql
+++ b/backend/script/sql/update/aihr_20260715_knowledge_feedback_mysql8.sql
@@ -3,7 +3,7 @@
 
 CREATE TABLE IF NOT EXISTS `aihr_knowledge_gap` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `query_text` varchar(1000) NOT NULL COMMENT '未命中问题',
   `category` varchar(100) DEFAULT NULL COMMENT '知识分类',
   `position` varchar(80) DEFAULT NULL COMMENT '岗位',
@@ -16,7 +16,7 @@ CREATE TABLE IF NOT EXISTS `aihr_knowledge_gap` (
 
 CREATE TABLE IF NOT EXISTS `aihr_knowledge_answer_feedback` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `query_text` varchar(1000) NOT NULL COMMENT '问题原文',
   `query_norm` varchar(500) NOT NULL COMMENT '规范化问题',
   `fragment_id` bigint NOT NULL COMMENT '知识片段ID',
diff --git a/backend/script/sql/update/aihr_20260715_position_sop_qualification_mysql8.sql b/backend/script/sql/update/aihr_20260715_position_sop_qualification_mysql8.sql
index a344e8f1..d17efab6 100644
--- a/backend/script/sql/update/aihr_20260715_position_sop_qualification_mysql8.sql
+++ b/backend/script/sql/update/aihr_20260715_position_sop_qualification_mysql8.sql
@@ -4,7 +4,7 @@
 
 CREATE TABLE IF NOT EXISTS `aihr_position_responsibility` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) NOT NULL DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL DEFAULT '000000' COMMENT '租户编号',
   `position_code` varchar(80) NOT NULL COMMENT '岗位编码',
   `responsibility_text` varchar(1000) NOT NULL COMMENT '岗位职责',
   `sop_id` bigint DEFAULT NULL COMMENT '关联SOP主键（跨模块引用）',
@@ -21,7 +21,7 @@ CREATE TABLE IF NOT EXISTS `aihr_position_responsibility` (
 
 CREATE TABLE IF NOT EXISTS `aihr_sop_applicability` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) NOT NULL DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL DEFAULT '000000' COMMENT '租户编号',
   `sop_id` bigint DEFAULT NULL COMMENT '关联SOP主键（跨模块引用）',
   `sop_code` varchar(100) DEFAULT NULL COMMENT '关联SOP编码',
   `project_type` varchar(80) DEFAULT NULL COMMENT '项目类型：住宅/公建/景区等',
@@ -39,7 +39,7 @@ CREATE TABLE IF NOT EXISTS `aihr_sop_applicability` (
 
 CREATE TABLE IF NOT EXISTS `aihr_onboard_task` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) NOT NULL DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL DEFAULT '000000' COMMENT '租户编号',
   `ext_party_id` varchar(100) NOT NULL COMMENT '员工外部主体ID，不复制姓名',
   `project_code` varchar(100) DEFAULT NULL COMMENT '项目编码',
   `position_code` varchar(80) DEFAULT NULL COMMENT '岗位编码',
@@ -61,7 +61,7 @@ CREATE TABLE IF NOT EXISTS `aihr_onboard_task` (
 
 CREATE TABLE IF NOT EXISTS `aihr_qualification_gate` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) NOT NULL DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL DEFAULT '000000' COMMENT '租户编号',
   `ext_party_id` varchar(100) NOT NULL COMMENT '员工外部主体ID，不复制姓名',
   `project_code` varchar(100) DEFAULT NULL COMMENT '项目编码',
   `position_code` varchar(80) NOT NULL COMMENT '岗位编码',
diff --git a/backend/script/sql/update/aihr_20260715_tenant_collation_mysql8.sql b/backend/script/sql/update/aihr_20260715_tenant_collation_mysql8.sql
new file mode 100644
index 00000000..c6c4e2ce
--- /dev/null
+++ b/backend/script/sql/update/aihr_20260715_tenant_collation_mysql8.sql
@@ -0,0 +1,70 @@
+-- Keep AIHR tenant identifiers compatible with the framework tenant contract.
+-- This migration derives the target charset/collation from sys_oss.tenant_id,
+-- preserves each AIHR tenant_id column's nullability/default/comment, and is idempotent.
+
+DROP PROCEDURE IF EXISTS aihr_align_tenant_collation;
+
+DELIMITER $$
+
+CREATE PROCEDURE aihr_align_tenant_collation()
+BEGIN
+  DECLARE done int DEFAULT 0;
+  DECLARE target_charset varchar(64);
+  DECLARE target_collation varchar(64);
+  DECLARE current_table varchar(64);
+  DECLARE current_type text;
+  DECLARE current_nullable varchar(3);
+  DECLARE current_default text;
+  DECLARE current_comment text;
+
+  DECLARE tenant_columns CURSOR FOR
+    SELECT table_name, column_type, is_nullable, column_default, column_comment
+      FROM information_schema.columns
+     WHERE table_schema = DATABASE()
+       AND LEFT(table_name, 5) = 'aihr_'
+       AND column_name = 'tenant_id'
+       AND collation_name <> target_collation
+     ORDER BY table_name;
+  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
+
+  SELECT character_set_name, collation_name
+    INTO target_charset, target_collation
+    FROM information_schema.columns
+   WHERE table_schema = DATABASE()
+     AND table_name = 'sys_oss'
+     AND column_name = 'tenant_id'
+   LIMIT 1;
+
+  IF target_charset IS NULL OR target_collation IS NULL THEN
+    SIGNAL SQLSTATE '45000'
+      SET MESSAGE_TEXT = 'sys_oss.tenant_id charset/collation contract is missing';
+  END IF;
+
+  OPEN tenant_columns;
+  align_loop: LOOP
+    FETCH tenant_columns
+      INTO current_table, current_type, current_nullable, current_default, current_comment;
+    IF done = 1 THEN
+      LEAVE align_loop;
+    END IF;
+
+    SET @aihr_tenant_ddl = CONCAT(
+      'ALTER TABLE `', REPLACE(current_table, '`', '``'),
+      '` MODIFY COLUMN `tenant_id` ', current_type,
+      ' CHARACTER SET `', REPLACE(target_charset, '`', '``'),
+      '` COLLATE `', REPLACE(target_collation, '`', '``'), '`',
+      IF(current_nullable = 'YES', ' NULL', ' NOT NULL'),
+      IF(current_default IS NULL, '', CONCAT(' DEFAULT ', QUOTE(current_default))),
+      ' COMMENT ', QUOTE(COALESCE(current_comment, ''))
+    );
+    PREPARE aihr_tenant_statement FROM @aihr_tenant_ddl;
+    EXECUTE aihr_tenant_statement;
+    DEALLOCATE PREPARE aihr_tenant_statement;
+  END LOOP;
+  CLOSE tenant_columns;
+END$$
+
+DELIMITER ;
+
+CALL aihr_align_tenant_collation();
+DROP PROCEDURE aihr_align_tenant_collation;