feat(*): add RAG support

frontend/src/lib/convex/schema.ts

@@ -10,7 +10,13 @@ export default defineSchema({
 		followUpPrompt: v.optional(v.string()),
 		model: v.string(),
 		followUpModel: v.optional(v.string()),
-		activeChatId: v.optional(v.id('chats'))
+		activeChatId: v.optional(v.id('chats')),
+		ragCollectionMode: v.optional(
+			v.object({
+				ragDatabaseId: v.id('ragDatabases'),
+				activeSince: v.number()
+			})
+		)
 	}).index('by_telegram_id', ['telegramId']),
 
 	chats: defineTable({
@@ -98,5 +104,23 @@ export default defineSchema({
 		base64: v.string(),
 		mediaType: v.string(),
 		createdAt: v.number()
-	}).index('by_chat_id_and_device_id', ['chatId', 'deviceId'])
+	}).index('by_chat_id_and_device_id', ['chatId', 'deviceId']),
+
+	ragDatabases: defineTable({
+		userId: v.id('users'),
+		name: v.string(),
+		createdAt: v.number()
+	})
+		.index('by_user_id', ['userId'])
+		.index('by_user_id_and_name', ['userId', 'name']),
+
+	ragConnections: defineTable({
+		userId: v.id('users'),
+		ragDatabaseId: v.id('ragDatabases'),
+		isGlobal: v.boolean(),
+		createdAt: v.number()
+	})
+		.index('by_user_id', ['userId'])
+		.index('by_user_id_and_rag_database_id', ['userId', 'ragDatabaseId'])
+		.index('by_rag_database_id', ['ragDatabaseId'])
 });