chore(content): merge content full implementation into main

Merge feat/content-ai09 with complete content service

services/content/src/questions/questions.schema.ts

@@ -1,23 +1,41 @@
 import {
   mysqlTable,
-  char,
   varchar,
   text,
-  int,
+  tinyint,
   timestamp,
+  json,
+  index,
 } from "drizzle-orm/mysql-core";
 
-export const questions = mysqlTable("content_questions", {
-  id: char("id", { length: 36 }).notNull().primaryKey(),
-  knowledgePointId: char("knowledge_point_id", { length: 36 }).notNull(),
-  type: varchar("type", { length: 50 }).notNull(),
-  content: text("content").notNull(),
-  answer: text("answer"),
-  explanation: text("explanation"),
-  difficulty: int("difficulty").default(3),
-  createdAt: timestamp("created_at").notNull().defaultNow(),
-  updatedAt: timestamp("updated_at").notNull().defaultNow().onUpdateNow(),
-});
+export const questions = mysqlTable(
+  "content_questions",
+  {
+    id: varchar("id", { length: 32 }).notNull().primaryKey(),
+    knowledgePointId: varchar("knowledge_point_id", { length: 32 }).notNull(),
+    type: varchar("type", { length: 32 }).notNull(),
+    content: text("content").notNull(),
+    options: json("options").$type<Record<string, unknown> | null>(),
+    answer: text("answer").notNull(),
+    explanation: text("explanation"),
+    difficulty: tinyint("difficulty").notNull().default(3),
+    status: varchar("status", { length: 32 }).notNull().default("draft"),
+    source: varchar("source", { length: 32 }).notNull().default("manual"),
+    createdBy: varchar("created_by", { length: 32 }).notNull(),
+    metadata: json("metadata").$type<Record<string, unknown> | null>(),
+    createdAt: timestamp("created_at").notNull().defaultNow(),
+    updatedAt: timestamp("updated_at").notNull().defaultNow().onUpdateNow(),
+  },
+  (table) => ({
+    kpIdx: index("idx_questions_kp").on(table.knowledgePointId),
+    typeDifficultyIdx: index("idx_questions_type_difficulty").on(
+      table.type,
+      table.difficulty,
+    ),
+    statusIdx: index("idx_questions_status").on(table.status),
+    sourceIdx: index("idx_questions_source").on(table.source),
+  }),
+);
 
 export type Question = typeof questions.$inferSelect;
 export type NewQuestion = typeof questions.$inferInsert;