initialize project with basic structure and dependencies

server/db/schema.ts

@@ -46,6 +46,7 @@ export const topics = sqliteTable("topics", {
   prerequisiteTopicIds: text("prerequisite_topic_ids").notNull().default("[]"),
   difficulty: integer("difficulty").notNull().default(1),
   relevantFiles: text("relevant_files"),
+  status: text("status", { enum: ["pending", "generating", "ready", "error"] }).notNull().default("pending"),
 });
 
 export const lessons = sqliteTable("lessons", {
@@ -55,6 +56,12 @@ export const lessons = sqliteTable("lessons", {
     .references(() => topics.id),
   content: text("content").notNull(),
   ttsProvider: text("tts_provider"),
+  costAI: real("cost_ai").default(0),
+  costAudio: real("cost_audio").default(0),
+  costBranchAI: real("cost_branch_ai").default(0),
+  costBranchAudio: real("cost_branch_audio").default(0),
+  costTotal: real("cost_total").default(0),
+  branchStatus: text("branch_status", { enum: ["pending", "generating", "ready", "error"] }).notNull().default("pending"),
   createdAt: text("created_at")
     .notNull()
     .default(sql`(datetime('now'))`),