diff --git a/packages/dao/src/danmaku-cache.ts b/packages/dao/src/danmaku-cache.ts
new file mode 100644
index 0000000..ace6ef9
--- /dev/null
+++ b/packages/dao/src/danmaku-cache.ts
@@ -0,0 +1,45 @@
+import { and, eq, gt, isNull, or } from "drizzle-orm";
+import { danmakuCache, type DanmakuCacheRow } from "@app/models";
+import { db } from "@app/db";
+
+export const danmakuCacheDao = {
+    async getValid(matchKey: string): Promise<DanmakuCacheRow | null> {
+        const now = new Date();
+        const [row] = await db
+            .select()
+            .from(danmakuCache)
+            .where(
+                and(
+                    eq(danmakuCache.matchKey, matchKey),
+                    or(isNull(danmakuCache.expiresAt), gt(danmakuCache.expiresAt, now)),
+                ),
+            )
+            .limit(1);
+        return row ?? null;
+    },
+    async upsert(data: {
+        matchKey: string;
+        payload: string;
+        source: string;
+        expiresAt: Date | null;
+    }): Promise<DanmakuCacheRow> {
+        const existing = await db
+            .select()
+            .from(danmakuCache)
+            .where(eq(danmakuCache.matchKey, data.matchKey))
+            .limit(1);
+        if (existing[0]) {
+            const [row] = await db
+                .update(danmakuCache)
+                .set({ payload: data.payload, source: data.source, expiresAt: data.expiresAt })
+                .where(eq(danmakuCache.id, existing[0].id))
+                .returning();
+            if (!row) throw new Error("Failed to update danmaku cache");
+            return row;
+        }
+        const rows = await db.insert(danmakuCache).values(data).returning();
+        const row = rows[0];
+        if (!row) throw new Error("Failed to insert danmaku cache");
+        return row;
+    },
+};
diff --git a/packages/dao/src/index.ts b/packages/dao/src/index.ts
index 338e53b..8edc9fb 100644
--- a/packages/dao/src/index.ts
+++ b/packages/dao/src/index.ts
@@ -5,3 +5,9 @@ export { sessionDao } from "./sessions.js";
 export type { SessionRow } from "./sessions.js";
 export { passwordResetDao } from "./password-resets.js";
 export type { PasswordResetRow } from "./password-resets.js";
+export { mountDao } from "./mounts.js";
+export type { MountRow } from "./mounts.js";
+export { mediaItemDao } from "./media-items.js";
+export type { MediaItemRow } from "./media-items.js";
+export { playbackProgressDao } from "./playback-progress.js";
+export { danmakuCacheDao } from "./danmaku-cache.js";
diff --git a/packages/dao/src/media-items.ts b/packages/dao/src/media-items.ts
new file mode 100644
index 0000000..034ec39
--- /dev/null
+++ b/packages/dao/src/media-items.ts
@@ -0,0 +1,114 @@
+import { and, desc, eq, like, or, sql } from "drizzle-orm";
+import { mediaItems, type MediaItem } from "@app/models";
+import { db } from "@app/db";
+
+export type MediaItemRow = MediaItem;
+
+export const mediaItemDao = {
+    async list(
+        userId: string,
+        params: {
+            limit: number;
+            offset: number;
+            scrapeStatus?: string | undefined;
+            q?: string | undefined;
+        },
+    ): Promise<{ rows: MediaItemRow[]; total: number }> {
+        const conds = [eq(mediaItems.userId, userId)];
+        if (params.scrapeStatus) conds.push(eq(mediaItems.scrapeStatus, params.scrapeStatus));
+        if (params.q) {
+            const likeQ = `%${params.q}%`;
+            const qCond = or(like(mediaItems.title, likeQ), like(mediaItems.rawName, likeQ));
+            if (qCond) conds.push(qCond);
+        }
+        const where = and(...conds);
+        const rows = await db
+            .select()
+            .from(mediaItems)
+            .where(where)
+            .orderBy(desc(mediaItems.updatedAt))
+            .limit(params.limit)
+            .offset(params.offset);
+        const [countRow] = await db
+            .select({ count: sql<number>`count(*)` })
+            .from(mediaItems)
+            .where(where);
+        return { rows, total: Number(countRow?.["count"] ?? 0) };
+    },
+    async getByIdForUser(id: string, userId: string): Promise<MediaItemRow | null> {
+        const [row] = await db
+            .select()
+            .from(mediaItems)
+            .where(and(eq(mediaItems.id, id), eq(mediaItems.userId, userId)))
+            .limit(1);
+        return row ?? null;
+    },
+    async getByUserPath(userId: string, path: string): Promise<MediaItemRow | null> {
+        const [row] = await db
+            .select()
+            .from(mediaItems)
+            .where(and(eq(mediaItems.userId, userId), eq(mediaItems.path, path)))
+            .limit(1);
+        return row ?? null;
+    },
+    async upsertFromScan(data: {
+        userId: string;
+        mountId: string;
+        path: string;
+        rawName: string;
+        title: string;
+        size: number;
+        mime?: string | undefined;
+    }): Promise<MediaItemRow> {
+        const existing = await this.getByUserPath(data.userId, data.path);
+        if (existing) {
+            const [row] = await db
+                .update(mediaItems)
+                .set({
+                    size: data.size,
+                    mime: data.mime,
+                    updatedAt: new Date(),
+                    scannedAt: new Date(),
+                })
+                .where(eq(mediaItems.id, existing.id))
+                .returning();
+            if (!row) throw new Error("Failed to update media item");
+            return row;
+        }
+        const rows = await db
+            .insert(mediaItems)
+            .values({
+                userId: data.userId,
+                mountId: data.mountId,
+                path: data.path,
+                rawName: data.rawName,
+                title: data.title,
+                size: data.size,
+                mime: data.mime,
+                scrapeStatus: "pending",
+            })
+            .returning();
+        const row = rows[0];
+        if (!row) throw new Error("Failed to insert media item");
+        return row;
+    },
+    async updateScrape(
+        id: string,
+        userId: string,
+        data: {
+            bangumiId?: number | null;
+            epNumber?: number | null;
+            scrapeStatus: string;
+            scrapedAt?: Date | null;
+            posterUrl?: string | null;
+            title?: string;
+        },
+    ): Promise<MediaItemRow | null> {
+        const [row] = await db
+            .update(mediaItems)
+            .set({ ...data, updatedAt: new Date() })
+            .where(and(eq(mediaItems.id, id), eq(mediaItems.userId, userId)))
+            .returning();
+        return row ?? null;
+    },
+};
diff --git a/packages/dao/src/mounts.ts b/packages/dao/src/mounts.ts
new file mode 100644
index 0000000..a4b0fae
--- /dev/null
+++ b/packages/dao/src/mounts.ts
@@ -0,0 +1,44 @@
+import { and, desc, eq } from "drizzle-orm";
+import { mounts, type Mount, type NewMount } from "@app/models";
+import { db } from "@app/db";
+
+export type MountRow = Mount;
+
+export const mountDao = {
+    async listByUser(userId: string): Promise<MountRow[]> {
+        return db
+            .select()
+            .from(mounts)
+            .where(eq(mounts.userId, userId))
+            .orderBy(desc(mounts.createdAt));
+    },
+    async getByIdForUser(id: string, userId: string): Promise<MountRow | null> {
+        const [row] = await db
+            .select()
+            .from(mounts)
+            .where(and(eq(mounts.id, id), eq(mounts.userId, userId)))
+            .limit(1);
+        return row ?? null;
+    },
+    async create(data: NewMount): Promise<MountRow> {
+        const rows = await db.insert(mounts).values(data).returning();
+        const row = rows[0];
+        if (!row) throw new Error("Failed to create mount");
+        return row;
+    },
+    async update(
+        id: string,
+        userId: string,
+        data: Partial<Omit<NewMount, "id" | "userId">>,
+    ): Promise<MountRow | null> {
+        const [row] = await db
+            .update(mounts)
+            .set({ ...data, updatedAt: new Date() })
+            .where(and(eq(mounts.id, id), eq(mounts.userId, userId)))
+            .returning();
+        return row ?? null;
+    },
+    async delete(id: string, userId: string): Promise<void> {
+        await db.delete(mounts).where(and(eq(mounts.id, id), eq(mounts.userId, userId)));
+    },
+};
diff --git a/packages/dao/src/playback-progress.ts b/packages/dao/src/playback-progress.ts
new file mode 100644
index 0000000..32897fe
--- /dev/null
+++ b/packages/dao/src/playback-progress.ts
@@ -0,0 +1,43 @@
+import { and, eq } from "drizzle-orm";
+import { playbackProgress, type PlaybackProgress } from "@app/models";
+import { db } from "@app/db";
+
+export const playbackProgressDao = {
+    async get(userId: string, mediaItemId: string): Promise<PlaybackProgress | null> {
+        const [row] = await db
+            .select()
+            .from(playbackProgress)
+            .where(
+                and(
+                    eq(playbackProgress.userId, userId),
+                    eq(playbackProgress.mediaItemId, mediaItemId),
+                ),
+            )
+            .limit(1);
+        return row ?? null;
+    },
+    async upsert(
+        userId: string,
+        mediaItemId: string,
+        positionMs: number,
+        durationMs: number,
+    ): Promise<PlaybackProgress> {
+        const existing = await this.get(userId, mediaItemId);
+        if (existing) {
+            const [row] = await db
+                .update(playbackProgress)
+                .set({ positionMs, durationMs, updatedAt: new Date() })
+                .where(eq(playbackProgress.id, existing.id))
+                .returning();
+            if (!row) throw new Error("Failed to update progress");
+            return row;
+        }
+        const rows = await db
+            .insert(playbackProgress)
+            .values({ userId, mediaItemId, positionMs, durationMs })
+            .returning();
+        const row = rows[0];
+        if (!row) throw new Error("Failed to insert progress");
+        return row;
+    },
+};