fix: token统计+聊天记录入库静默失败, 列名/类型/去重不匹配

根因：insert_llm_usage / insert_chat_record 因旧 iPet 遗留列 (kind/entry NOT NULL,
context_token_present boolean→context_token text) 导致 INSERT 静默失败,
四个调用点 let _ = 吞掉错误。ias usage 显示 token 总量为 0。

修复：
- llm_usage: 迁移 0010 ADD COLUMN IF NOT EXISTS + 条件 DROP NOT NULL,
  insert_llm_usage 写入 kind/entry 默认值
- chat_records: 迁移 0011 列名 context_token_present→context_token 类型转换+重命名,
  迁移 0012 清理存量重复→partial UNIQUE index→恢复 ON CONFLICT
- main.rs: 所有 let _ = insert_* 改为 if let Err(e) 日志输出,
  message_id 缺失时归为 '' 而非 '0'

migrations/20260601000010_fix_llm_usage_legacy_columns.sql

@@ -0,0 +1,18 @@
+-- 修复 llm_usage 表兼容性：旧库有 iPet 遗留的 kind/entry 列 (NOT NULL)，新库没有
+-- kind/entry 保留为兼容字段，新代码写入默认值 ("llm_call" / null)
+-- 1) 添加列（如果不存在）
+ALTER TABLE llm_usage ADD COLUMN IF NOT EXISTS kind TEXT;
+ALTER TABLE llm_usage ADD COLUMN IF NOT EXISTS entry JSONB;
+-- 2) 只在列存在且 NOT NULL 时解除约束
+DO $$
+BEGIN
+    IF EXISTS (SELECT 1 FROM information_schema.columns
+               WHERE table_name = 'llm_usage' AND column_name = 'kind' AND is_nullable = 'NO') THEN
+        ALTER TABLE llm_usage ALTER COLUMN kind DROP NOT NULL;
+    END IF;
+    IF EXISTS (SELECT 1 FROM information_schema.columns
+               WHERE table_name = 'llm_usage' AND column_name = 'entry' AND is_nullable = 'NO') THEN
+        ALTER TABLE llm_usage ALTER COLUMN entry DROP NOT NULL;
+    END IF;
+END;
+$$;

migrations/20260601000011_fix_chat_records_context_token.sql

@@ -0,0 +1,26 @@
+-- 修复 chat_records 表中 iPet 遗留的 context_token_present (boolean) → context_token (text)
+-- 迁移 0001 创建的是 context_token TEXT，但旧库中列名是 context_token_present BOOLEAN
+DO $$
+BEGIN
+    IF EXISTS (SELECT 1 FROM information_schema.columns
+               WHERE table_name = 'chat_records' AND column_name = 'context_token_present') THEN
+
+        IF EXISTS (SELECT 1 FROM information_schema.columns
+                   WHERE table_name = 'chat_records' AND column_name = 'context_token') THEN
+            -- 两列都存在（混合/半迁移库）：回填数据后删除旧列
+            UPDATE chat_records
+                SET context_token = CASE WHEN context_token_present::boolean THEN '1' ELSE '' END
+                WHERE context_token = '';
+            ALTER TABLE chat_records DROP COLUMN context_token_present;
+        ELSE
+            -- 只有旧列：类型转换 boolean → text (true → '1', false → '')，再重命名
+            ALTER TABLE chat_records
+                ALTER COLUMN context_token_present TYPE TEXT
+                USING CASE WHEN context_token_present::boolean THEN '1' ELSE '' END;
+            ALTER TABLE chat_records RENAME COLUMN context_token_present TO context_token;
+            ALTER TABLE chat_records ALTER COLUMN context_token SET DEFAULT '';
+        END IF;
+
+    END IF;
+END;
+$$;

migrations/20260601000012_fix_chat_dedup.sql

@@ -0,0 +1,12 @@
+-- 聊天记录去重：清理存量重复 → 建 partial UNIQUE 索引支持 ON CONFLICT
+-- 1) 删除重复记录（保留每个 message_id 最早的那条）
+DELETE FROM chat_records a
+USING chat_records b
+WHERE a.message_id = b.message_id
+  AND a.message_id NOT IN ('', '0')
+  AND a.id > b.id;
+
+-- 2) 替换旧普通索引为 UNIQUE partial index（排除空和占位值）
+DROP INDEX IF EXISTS idx_chat_records_message_id;
+CREATE UNIQUE INDEX idx_chat_records_message_id
+    ON chat_records (message_id) WHERE message_id NOT IN ('', '0');