diff --git a/packages/backend/lib/auth.ts b/packages/backend/lib/auth.ts
index 17ea336..2c03942 100644
--- a/packages/backend/lib/auth.ts
+++ b/packages/backend/lib/auth.ts
@@ -68,13 +68,9 @@ export async function createSession(
 export async function validateSession(
 	sessionId: string
 ): Promise<{ user: User; session: any } | null> {
-	const session = await db
-		.select({
-			...getTableColumns(usersInCredentials),
-			...getTableColumns(loginSessionsInCredentials)
-		})
+	const sessions = await db
+		.select()
 		.from(loginSessionsInCredentials)
-		.innerJoin(usersInCredentials, eq(loginSessionsInCredentials.uid, usersInCredentials.id))
 		.where(
 			and(
 				eq(loginSessionsInCredentials.id, sessionId),
@@ -83,23 +79,23 @@ export async function validateSession(
 		)
 		.limit(1);
 
-	if (session.length === 0) {
+	if (sessions.length === 0) {
 		return null;
 	}
 
-	const foundSession = session[0];
+	const session = sessions[0];
 
-	if (foundSession.expireAt && new Date(foundSession.expireAt) < new Date()) {
+	if (session.expireAt && new Date(session.expireAt) < new Date()) {
 		return null;
 	}
 
-	const user = await db
+	const users = await db
 		.select()
 		.from(usersInCredentials)
-		.where(eq(usersInCredentials.id, foundSession.uid))
+		.where(eq(usersInCredentials.id, session.uid))
 		.limit(1);
 
-	if (user.length === 0) {
+	if (users.length === 0) {
 		return null;
 	}
 
@@ -109,8 +105,8 @@ export async function validateSession(
 		.where(eq(loginSessionsInCredentials.id, sessionId));
 
 	return {
-		user: user[0],
-		session: foundSession
+		user: users[0],
+		session: session
 	};
 }
 
diff --git a/packages/backend/middlewares/auth.ts b/packages/backend/middlewares/auth.ts
index 6be45ad..e29d358 100644
--- a/packages/backend/middlewares/auth.ts
+++ b/packages/backend/middlewares/auth.ts
@@ -30,6 +30,8 @@ export const requireAuth = new Elysia({ name: "require-auth" })
 			const authHeader = headers.authorization;
 			if (authHeader.startsWith("Bearer ")) {
 				sessionId = authHeader.substring(7);
+			} else if (authHeader.startsWith("Token ")) {
+				sessionId = authHeader.substring(6);
 			}
 		}
 
diff --git a/packages/backend/package.json b/packages/backend/package.json
index 263e637..0af518e 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "backend",
-	"version": "1.0.0",
+	"version": "1.1.0",
 	"scripts": {
 		"dev": "NODE_ENV=development bun run --watch src/index.ts",
 		"start": "NODE_ENV=production bun run src/index.ts",
diff --git a/packages/backend/routes/auth/login.ts b/packages/backend/routes/auth/login.ts
index a7de193..64f4101 100644
--- a/packages/backend/routes/auth/login.ts
+++ b/packages/backend/routes/auth/login.ts
@@ -16,7 +16,7 @@ export const loginHandler = new Elysia({ prefix: "/auth" }).use(ip()).post(
 		const userAgent = request.headers.get("user-agent") || "Unknown";
 		const sessionId = await createSession(user.id, ip || null, userAgent);
 
-		const expiresAt = getSessionExpirationDate();
+		const expiresAt = getSessionExpirationDate(365);
 		cookie.sessionId.value = sessionId;
 		cookie.sessionId.httpOnly = true;
 		cookie.sessionId.secure = process.env.NODE_ENV === "production";
@@ -53,6 +53,13 @@ export const loginHandler = new Elysia({ prefix: "/auth" }).use(ip()).post(
 		body: t.Object({
 			username: t.String(),
 			password: t.String()
-		})
+		}),
+		detail: {
+			summary: "User login",
+			description:
+				"This endpoint authenticates users by verifying their credentials and creates a new session. \
+			Upon successful authentication, it returns user information and sets a secure HTTP-only cookie \
+			for session management. The session includes IP address and user agent tracking for security purposes."
+		}
 	}
 );
diff --git a/packages/backend/routes/auth/logout.ts b/packages/backend/routes/auth/logout.ts
index fa227f9..7d13b80 100644
--- a/packages/backend/routes/auth/logout.ts
+++ b/packages/backend/routes/auth/logout.ts
@@ -1,50 +1,37 @@
 import { Elysia, t } from "elysia";
 import { deactivateSession } from "@backend/lib/auth";
+import requireAuth from "@backend/middlewares/auth";
 
-export const logoutHandler = new Elysia({ prefix: "/auth" })
-	.delete(
-		"/session",
-		async ({ set, cookie }) => {
-			const sessionId = cookie.sessionId?.value;
+export const logoutHandler = new Elysia({ prefix: "/auth" }).use(requireAuth).delete(
+	"/session",
+	async ({ set, session, cookie }) => {
+		const sessionId = session.sessionId;
 
-			if (!sessionId) {
-				set.status = 401;
-				return { message: "Not authenticated." };
-			}
-
-			await deactivateSession(sessionId as string);
-			cookie.sessionId.remove();
-
-			return { message: "Successfully logged out." };
-		},
-		{
-			response: {
-				200: t.Object({
-					message: t.String()
-				}),
-				401: t.Object({
-					message: t.String()
-				})
-			}
+		if (!sessionId) {
+			set.status = 401;
+			return { message: "Not authenticated." };
 		}
-	)
-	.delete(
-		"/session/:id",
-		async ({ params }) => {
-			const sessionId = params.id;
 
-			await deactivateSession(sessionId as string);
+		await deactivateSession(sessionId as string);
+		cookie.sessionId.remove();
 
-			return { message: "Successfully logged out." };
+		return { message: "Successfully logged out." };
+	},
+	{
+		response: {
+			200: t.Object({
+				message: t.String()
+			}),
+			401: t.Object({
+				message: t.String()
+			})
 		},
-		{
-			response: {
-				200: t.Object({
-					message: t.String()
-				}),
-				401: t.Object({
-					message: t.String()
-				})
-			}
+		detail: {
+			summary: "Logout current session",
+			description:
+				"This endpoint logs out the current user by deactivating their session and removing the session cookie. \
+				It requires an active session cookie to be present in the request. After successful logout, the session \
+				is invalidated and cannot be used again."
 		}
-	);
+	}
+);
diff --git a/packages/backend/routes/search/index.ts b/packages/backend/routes/search/index.ts
index d703f29..724560a 100644
--- a/packages/backend/routes/search/index.ts
+++ b/packages/backend/routes/search/index.ts
@@ -150,6 +150,14 @@ export const searchHandler = new Elysia({ prefix: "/search" }).get(
 		},
 		query: z.object({
 			query: z.string()
-		})
+		}),
+		detail: {
+			summary: "Search songs and videos",
+			description:
+				"This endpoint performs a comprehensive search across songs and videos in the database. \
+			It searches for songs by name and videos by bilibili ID (av/BV format). The results are ranked \
+			by relevance using a weighted algorithm that considers search term frequency, title length, \
+			and view count. Returns search results with performance timing information."
+		}
 	}
 );
diff --git a/packages/backend/routes/song/add.ts b/packages/backend/routes/song/add.ts
index 9fcf7b8..4fa6a70 100644
--- a/packages/backend/routes/song/add.ts
+++ b/packages/backend/routes/song/add.ts
@@ -62,7 +62,15 @@ export const addSongHandler = new Elysia()
 			},
 			body: t.Object({
 				id: t.String()
-			})
+			}),
+			detail: {
+				summary: "Import song from bilibili",
+				description:
+					"This endpoint allows authenticated users to import a song from bilibili by providing a video ID. \
+				The video ID can be in av or BV format. The system validates the ID format, checks if the video already \
+				exists in the database, and if not, creates a background job to fetch video metadata and add it to the songs collection. \
+				Returns the job ID for tracking the import progress."
+			}
 		}
 	)
 	.get(
@@ -106,6 +114,13 @@ export const addSongHandler = new Elysia()
 			},
 			params: t.Object({
 				id: t.String()
-			})
+			}),
+			detail: {
+				summary: "Check import job status",
+				description:
+					"This endpoint retrieves the current status of a song import job. It returns the job state \
+				(completed, failed, active, etc.), the result if completed, and any failure reason if the job failed. \
+				Use this endpoint to monitor the progress of song imports initiated through the import endpoint."
+			}
 		}
 	);
diff --git a/packages/backend/routes/song/delete.ts b/packages/backend/routes/song/delete.ts
index 8a1024c..e33368e 100644
--- a/packages/backend/routes/song/delete.ts
+++ b/packages/backend/routes/song/delete.ts
@@ -32,6 +32,13 @@ export const deleteSongHandler = new Elysia({ prefix: "/song" }).use(requireAuth
 		},
 		params: t.Object({
 			id: t.String()
-		})
+		}),
+		detail: {
+			summary: "Delete song",
+			description:
+				"This endpoint allows authenticated users to soft-delete a song from the database. \
+			The song is marked as deleted rather than being permanently removed, preserving data integrity. \
+			The deletion is logged in the history table for audit purposes. Requires authentication and appropriate permissions."
+		}
 	}
 );
diff --git a/packages/backend/routes/song/info.ts b/packages/backend/routes/song/info.ts
index 8d763a4..9e7d7f3 100644
--- a/packages/backend/routes/song/info.ts
+++ b/packages/backend/routes/song/info.ts
@@ -158,7 +158,15 @@ const songInfoUpdateHandler = new Elysia({ prefix: "/song" }).use(requireAuth).p
 		body: t.Object({
 			name: t.Optional(t.String()),
 			producer: t.Optional(t.String())
-		})
+		}),
+		detail: {
+			summary: "Update song information",
+			description:
+				"This endpoint allows authenticated users to update song metadata. It accepts partial updates \
+			for song name and producer fields. The endpoint validates the song ID (accepting both internal database IDs \
+			and bilibili video IDs in av/BV format), applies the requested changes, and logs the update in the history table \
+			for audit purposes. Requires authentication."
+		}
 	}
 );
 
diff --git a/packages/backend/routes/song/milestone.ts b/packages/backend/routes/song/milestone.ts
index d694457..7fde260 100644
--- a/packages/backend/routes/song/milestone.ts
+++ b/packages/backend/routes/song/milestone.ts
@@ -50,6 +50,14 @@ export const closeMileStoneHandler = new Elysia({ prefix: "/songs" }).use(server
 			404: t.Object({
 				message: t.String()
 			})
+		},
+		detail: {
+			summary: "Get songs close to milestones",
+			description:
+				"This endpoint retrieves songs that are approaching significant view count milestones. \
+			It supports three milestone types: 'dendou' (0-100k views), 'densetsu' (100k-1M views), and 'shinwa' (1M-10M views). \
+			For each type, it returns videos that are within the specified view range and have an estimated time to reach \
+			the next milestone below the threshold. Results are ordered by estimated time to milestone."
 		}
 	}
 );
diff --git a/packages/backend/routes/video/eta.ts b/packages/backend/routes/video/eta.ts
index 8cd5ce1..86d1573 100644
--- a/packages/backend/routes/video/eta.ts
+++ b/packages/backend/routes/video/eta.ts
@@ -49,6 +49,14 @@ export const songEtaHandler = new Elysia({ prefix: "/video" }).get(
 		},
 		headers: t.Object({
 			Authorization: t.Optional(t.String())
-		})
+		}),
+		detail: {
+			summary: "Get video milestone ETA",
+			description:
+				"This endpoint retrieves the estimated time to reach the next milestone for a given video. \
+			It accepts video IDs in av or BV format and returns the current view count, estimated time to \
+			reach the next milestone (in hours), view growth speed, and last update timestamp. Useful for \
+			tracking video growth and milestone predictions."
+		}
 	}
 );
diff --git a/packages/backend/routes/video/metadata.ts b/packages/backend/routes/video/metadata.ts
index 814c16a..6419c57 100644
--- a/packages/backend/routes/video/metadata.ts
+++ b/packages/backend/routes/video/metadata.ts
@@ -88,6 +88,14 @@ export const getVideoMetadataHandler = new Elysia({ prefix: "/video" }).get(
 			200: t.Any(),
 			400: ErrorResponseSchema,
 			500: ErrorResponseSchema
+		},
+		detail: {
+			summary: "Get video metadata",
+			description:
+				"This endpoint retrieves comprehensive metadata for a bilibili video. It accepts video IDs in av or BV format \
+			and returns detailed information including title, description, uploader, statistics (views, likes, coins, etc.), \
+			and publication date. The data is cached for 60 seconds to reduce API calls. If the video is not in cache, \
+			it fetches fresh data from bilibili API and stores a snapshot in the database."
 		}
 	}
 );
diff --git a/packages/backend/routes/video/snapshots.ts b/packages/backend/routes/video/snapshots.ts
index 5cdc957..c788427 100644
--- a/packages/backend/routes/video/snapshots.ts
+++ b/packages/backend/routes/video/snapshots.ts
@@ -57,6 +57,14 @@ export const getVideoSnapshotsHandler = new Elysia({ prefix: "/video" }).get(
 			),
 			400: ErrorResponseSchema,
 			500: ErrorResponseSchema
+		},
+		detail: {
+			summary: "Get video snapshots",
+			description:
+				"This endpoint retrieves historical view count snapshots for a bilibili video. It accepts video IDs in av or BV format \
+			and returns a chronological list of snapshots showing how the video's statistics (views, likes, coins, favorites, etc.) \
+			have changed over time. If no snapshots exist for the video, it automatically queues a snapshot job to collect initial data. \
+			Results are ordered by creation date in descending order."
 		}
 	}
 );
diff --git a/packages/backend/src/index.ts b/packages/backend/src/index.ts
index 807d529..3e6dc99 100644
--- a/packages/backend/src/index.ts
+++ b/packages/backend/src/index.ts
@@ -16,6 +16,8 @@ import { deleteSongHandler } from "@backend/routes/song/delete";
 import { songEtaHandler } from "@backend/routes/video/eta";
 import "./mq";
 import pkg from "../package.json";
+import * as z from "zod";
+import { fromTypes } from "@elysiajs/openapi";
 
 const [host, port] = getBindingInfo();
 logStartup(host, port);
@@ -35,7 +37,25 @@ const app = new Elysia({
 	})
 	.use(onAfterHandler)
 	.use(cors())
-	.use(openapi())
+	.use(
+		openapi({
+			documentation: {
+				info: {
+					title: "CVSA API Docs",
+					version: pkg.version
+				}
+			},
+			mapJsonSchema: {
+				zod: z.toJSONSchema
+			},
+			references: fromTypes(),
+			scalar: {
+				theme: "kepler",
+				hideClientButton: true,
+				hideDarkModeToggle: true
+			}
+		})
+	)
 	.use(rootHandler)
 	.use(pingHandler)
 	.use(authHandler)
@@ -47,13 +67,29 @@ const app = new Elysia({
 	.use(addSongHandler)
 	.use(deleteSongHandler)
 	.use(songEtaHandler)
-	.get("/song/:id", ({ redirect, params }) => {
-		console.log(`/song/${params.id}/info`);
-		return redirect(`/song/${params.id}/info`, 302);
-	})
-	.get("/video/:id", ({ redirect, params }) => {
-		return redirect(`/video/${params.id}/info`, 302);
-	})
+	.get(
+		"/song/:id",
+		({ redirect, params }) => {
+			console.log(`/song/${params.id}/info`);
+			return redirect(`/song/${params.id}/info`, 302);
+		},
+		{
+			detail: {
+				hide: true
+			}
+		}
+	)
+	.get(
+		"/video/:id",
+		({ redirect, params }) => {
+			return redirect(`/video/${params.id}/info`, 302);
+		},
+		{
+			detail: {
+				hide: true
+			}
+		}
+	)
 	.listen(15412);
 
 export const VERSION = pkg.version;