chore(db): migration 0014 unique conversation title + LLM provider seed data

docs/api/schemas/mysql.md

@@ -158,6 +158,7 @@ ORM：[`UsageLogDB`](../../src/models/db_models.py)
 | `created_at` / `updated_at` | DATETIME | 创建 / 更新时间 |
 
 索引：
+- `uk_conversation_user_dataset_title(user_id, dataset_id, title)`
 - `idx_chat_conversation_user_pinned_updated(user_id, is_pinned, updated_at)`
 - `idx_chat_conversation_dataset_updated(dataset_id, updated_at)`
 

migrations/versions/0014_20260607_add_conversation_unique_title.py

@@ -0,0 +1,51 @@
+"""add unique title constraint for chat conversations
+
+Java requires conversation titles to be unique within the same user and dataset.
+Before adding the unique key, remove existing duplicates by keeping the newest
+conversation row (largest id) for each ``(user_id, dataset_id, title)`` group.
+
+Revision ID: 0014
+Revises: 0013
+Create Date: 2026-06-07
+"""
+
+from __future__ import annotations
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+
+revision: str = "0014"
+down_revision: Union[str, None] = "0013"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.execute(
+        sa.text(
+            """
+            DELETE c1 FROM chat_conversation c1
+            INNER JOIN chat_conversation c2
+              ON  c1.user_id = c2.user_id
+              AND c1.dataset_id = c2.dataset_id
+              AND c1.title = c2.title
+              AND c1.id < c2.id
+            """
+        )
+    )
+    op.create_unique_constraint(
+        "uk_conversation_user_dataset_title",
+        "chat_conversation",
+        ["user_id", "dataset_id", "title"],
+    )
+
+
+def downgrade() -> None:
+    op.drop_constraint(
+        "uk_conversation_user_dataset_title",
+        "chat_conversation",
+        type_="unique",
+    )

scripts/db/add_aliyun_system_presets.sql

@@ -0,0 +1,106 @@
+-- Add Aliyun DashScope system presets for remote dev.
+-- Do not store plaintext API keys in llm_system_preset.api_key.
+-- api_key below is encrypted with the current tolink.llm.api-key.secret
+-- using ApiKeyEncryptService AES-256-GCM format: base64(iv + cipherText + tag).
+
+USE tolink_rag_db;
+
+START TRANSACTION;
+
+-- Provider: Tongyi Qianwen uses the project's existing provider_type "aliyun".
+INSERT INTO llm_system_provider (
+    provider_type,
+    provider_name,
+    api_base_url,
+    is_active,
+    priority
+)
+VALUES (
+    'aliyun',
+    'Tongyi Qianwen (DashScope)',
+    'https://dashscope.aliyuncs.com/compatible-mode/v1',
+    TRUE,
+    99
+)
+ON DUPLICATE KEY UPDATE
+    provider_name = VALUES(provider_name),
+    api_base_url = VALUES(api_base_url),
+    is_active = TRUE,
+    priority = GREATEST(priority, VALUES(priority));
+
+-- Ensure the preset models exist in the provider model catalog.
+INSERT INTO llm_provider_model (
+    provider_id,
+    model_name,
+    capability,
+    is_active
+)
+SELECT p.id, m.model_name, m.capability, TRUE
+FROM llm_system_provider p
+JOIN (
+    SELECT 'qwen3.5-flash' AS model_name, 'CHAT' AS capability
+    UNION ALL SELECT 'text-embedding-v4', 'EMBEDDING'
+    UNION ALL SELECT 'qwen3-rerank', 'RERANK'
+    UNION ALL SELECT 'qwen-vl-max', 'VISION'
+) m
+WHERE p.provider_type = 'aliyun'
+ON DUPLICATE KEY UPDATE
+    is_active = TRUE;
+
+-- Active system presets are copied to new users as is_system_preset=true.
+-- Existing matching presets are updated to this key and enabled.
+INSERT INTO llm_system_preset (
+    provider_id,
+    model_name,
+    capability,
+    api_key,
+    is_active
+)
+SELECT p.id, m.model_name, m.capability,
+       'vIgEBTQxRc4g8WU4ghnMpwCOFiFAdN/AxaVwfGLa499SjFlsXJ/0HZ+a1A2qJdnokqPKM/yNlJ1SnF/3MU2+' AS api_key,
+       TRUE
+FROM llm_system_provider p
+JOIN (
+    SELECT 'qwen3.5-flash' AS model_name, 'CHAT' AS capability
+    UNION ALL SELECT 'text-embedding-v4', 'EMBEDDING'
+    UNION ALL SELECT 'qwen3-rerank', 'RERANK'
+    UNION ALL SELECT 'qwen-vl-max', 'VISION'
+) m
+WHERE p.provider_type = 'aliyun'
+ON DUPLICATE KEY UPDATE
+    api_key = VALUES(api_key),
+    is_active = TRUE,
+    updated_at = CURRENT_TIMESTAMP;
+
+-- Verification query.
+SELECT
+    p.provider_type,
+    p.provider_name,
+    p.api_base_url,
+    s.model_name,
+    s.capability,
+    s.is_active
+FROM llm_system_preset s
+JOIN llm_system_provider p ON p.id = s.provider_id
+WHERE p.provider_type = 'aliyun'
+  AND (s.model_name, s.capability) IN (
+      ('qwen3.5-flash', 'CHAT'),
+      ('text-embedding-v4', 'EMBEDDING'),
+      ('qwen3-rerank', 'RERANK'),
+      ('qwen-vl-max', 'VISION')
+  )
+ORDER BY FIELD(s.capability, 'CHAT', 'EMBEDDING', 'RERANK', 'VISION');
+
+COMMIT;
+
+-- Rollback if needed:
+-- DELETE s
+-- FROM llm_system_preset s
+-- JOIN llm_system_provider p ON p.id = s.provider_id
+-- WHERE p.provider_type = 'aliyun'
+--   AND (s.model_name, s.capability) IN (
+--       ('qwen3.5-flash', 'CHAT'),
+--       ('text-embedding-v4', 'EMBEDDING'),
+--       ('qwen3-rerank', 'RERANK'),
+--       ('qwen-vl-max', 'VISION')
+--   );

scripts/db/init.sql

@@ -107,6 +107,7 @@ CREATE TABLE IF NOT EXISTS chat_conversation (
     created_at      DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP,
     updated_at      DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
 
+    UNIQUE KEY uk_conversation_user_dataset_title (user_id, dataset_id, title),
     INDEX idx_chat_conversation_user_pinned_updated (user_id, is_pinned, updated_at),
     INDEX idx_chat_conversation_dataset_updated (dataset_id, updated_at)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 AUTO_INCREMENT=10000 COMMENT '对话表';