ci: MySql切换为PG

backend/prisma/schema.prisma

@@ -6,7 +6,7 @@ generator client {
 }
 
 datasource db {
-  provider = "mysql"
+  provider = "postgresql"
   url      = env("DATABASE_URL")
 }
 
@@ -25,7 +25,7 @@ model Account {
 
 model TranscodeRecord {
   id                Int       @id @default(autoincrement())
-  itemId            String    @index
+  itemId            String
   sourceLink        String    @db.Text
   driveType         String
   managedAccountId  Int
@@ -36,10 +36,13 @@ model TranscodeRecord {
   transferEndTime   DateTime?
   errorCode         String?
   errorMessage      String?   @db.Text
-  cleanupStatus     String    @default("pending") @index
+  cleanupStatus     String    @default("pending")
   createdAt         DateTime  @default(now())
   updatedAt         DateTime  @updatedAt
   account           Account   @relation(fields: [managedAccountId], references: [id])
+
+  @@index([itemId])
+  @@index([cleanupStatus])
 }
 
 model ActivityLog {
@@ -48,7 +51,7 @@ model ActivityLog {
   operationType    String
   clientIp         String?
   keyword          String?
-  itemId           String?   @index
+  itemId           String?
   driveType        String?
   managedAccountId Int?
   generatedLink    String?   @db.Text
@@ -57,4 +60,6 @@ model ActivityLog {
   durationMs       Int?
   details          String?   @db.Text
   account          Account?  @relation(fields: [managedAccountId], references: [id])
+
+  @@index([itemId])
 }