diff --git a/app/db/__init__.py b/app/db/__init__.py
new file mode 100644
index 0000000..980755b
--- /dev/null
+++ b/app/db/__init__.py
@@ -0,0 +1 @@
+# Database modules
diff --git a/app/db/community_sqlite.py b/app/db/community_sqlite.py
new file mode 100644
index 0000000..32d1f22
--- /dev/null
+++ b/app/db/community_sqlite.py
@@ -0,0 +1,753 @@
+"""
+SQLite storage for the private community module.
+"""
+
+from __future__ import annotations
+
+from collections import Counter
+from pathlib import Path
+from typing import Optional
+import os
+import re
+import sqlite3
+import time
+import uuid
+
+_ROOT = Path(__file__).resolve().parent.parent.parent
+DATA_DIR = Path(os.getenv("COMMUNITY_DATA_DIR", str(_ROOT / "data")))
+DB_PATH = DATA_DIR / "community.db"
+UPLOADS_DIR = DATA_DIR / "community_uploads"
+
+UPVOTE_REACTION = "UPVOTE"
+
+
+def _ensure_dirs() -> None:
+    DATA_DIR.mkdir(parents=True, exist_ok=True)
+    UPLOADS_DIR.mkdir(parents=True, exist_ok=True)
+
+
+def _get_conn() -> sqlite3.Connection:
+    _ensure_dirs()
+    conn = sqlite3.connect(str(DB_PATH))
+    conn.row_factory = sqlite3.Row
+    conn.execute("PRAGMA foreign_keys = ON")
+    return conn
+
+
+def _now_iso() -> str:
+    return time.strftime("%Y-%m-%dT%H:%M:%S.000Z", time.gmtime())
+
+
+def _normalize_memo_id(memo_id: str) -> str:
+    return memo_id.replace("memos/", "") if memo_id.startswith("memos/") else memo_id
+
+
+def _extract_tags(content: str) -> list[str]:
+    matches = re.findall(r"#[\w\u4e00-\u9fa5]+", content or "")
+    return list(dict.fromkeys(match.strip("#") for match in matches))
+
+
+def _extract_attachments(content: str) -> list[dict]:
+    items = []
+    for match in re.finditer(r"!\[([^\]]*)\]\(([^)]+)\)", content or ""):
+        alt, url = match.group(1).strip(), match.group(2).strip()
+        if url:
+            items.append({"url": url, "alt": alt})
+    return items
+
+
+def init_schema() -> None:
+    _ensure_dirs()
+    conn = _get_conn()
+    try:
+        conn.executescript(
+            """
+            CREATE TABLE IF NOT EXISTS community_memos (
+                id TEXT PRIMARY KEY,
+                user_id TEXT NOT NULL,
+                content TEXT NOT NULL,
+                pinned INTEGER NOT NULL DEFAULT 0,
+                visibility TEXT NOT NULL DEFAULT 'PRIVATE',
+                state TEXT NOT NULL DEFAULT 'NORMAL',
+                created TEXT NOT NULL,
+                updated TEXT NOT NULL
+            );
+            CREATE INDEX IF NOT EXISTS idx_memos_user ON community_memos(user_id);
+            CREATE INDEX IF NOT EXISTS idx_memos_state ON community_memos(state);
+            CREATE INDEX IF NOT EXISTS idx_memos_created ON community_memos(created);
+            CREATE INDEX IF NOT EXISTS idx_memos_pinned ON community_memos(pinned);
+
+            CREATE TABLE IF NOT EXISTS community_uploads (
+                id TEXT PRIMARY KEY,
+                user_id TEXT NOT NULL,
+                original_name TEXT NOT NULL,
+                filename TEXT NOT NULL UNIQUE,
+                content_type TEXT NOT NULL,
+                size INTEGER NOT NULL DEFAULT 0,
+                url TEXT NOT NULL,
+                created TEXT NOT NULL
+            );
+            CREATE INDEX IF NOT EXISTS idx_uploads_user ON community_uploads(user_id);
+            CREATE INDEX IF NOT EXISTS idx_uploads_created ON community_uploads(created);
+
+            CREATE TABLE IF NOT EXISTS community_comments (
+                id TEXT PRIMARY KEY,
+                memo_id TEXT NOT NULL,
+                user_id TEXT NOT NULL,
+                content TEXT NOT NULL,
+                created TEXT NOT NULL,
+                updated TEXT NOT NULL,
+                FOREIGN KEY (memo_id) REFERENCES community_memos(id) ON DELETE CASCADE
+            );
+            CREATE INDEX IF NOT EXISTS idx_comments_memo ON community_comments(memo_id, created);
+            CREATE INDEX IF NOT EXISTS idx_comments_user ON community_comments(user_id);
+
+            CREATE TABLE IF NOT EXISTS community_reactions (
+                id TEXT PRIMARY KEY,
+                memo_id TEXT NOT NULL,
+                user_id TEXT NOT NULL,
+                reaction_type TEXT NOT NULL,
+                created TEXT NOT NULL,
+                UNIQUE(memo_id, user_id, reaction_type),
+                FOREIGN KEY (memo_id) REFERENCES community_memos(id) ON DELETE CASCADE
+            );
+            CREATE INDEX IF NOT EXISTS idx_reactions_memo ON community_reactions(memo_id);
+            CREATE INDEX IF NOT EXISTS idx_reactions_user ON community_reactions(user_id);
+            """
+        )
+        conn.commit()
+    finally:
+        conn.close()
+
+
+def _base_memo_from_row(row: sqlite3.Row) -> dict:
+    content = row["content"]
+    return {
+        "id": row["id"],
+        "user_id": row["user_id"],
+        "content": content,
+        "pinned": bool(row["pinned"]),
+        "visibility": row["visibility"] or "PRIVATE",
+        "state": row["state"] or "NORMAL",
+        "created": row["created"],
+        "updated": row["updated"],
+        "tags": _extract_tags(content),
+        "attachments": _extract_attachments(content),
+    }
+
+
+def _comment_from_row(row: sqlite3.Row) -> dict:
+    return {
+        "id": row["id"],
+        "memo_id": row["memo_id"],
+        "user_id": row["user_id"],
+        "content": row["content"],
+        "created": row["created"],
+        "updated": row["updated"],
+    }
+
+
+def _comment_count(conn: sqlite3.Connection, memo_id: str) -> int:
+    cursor = conn.execute("SELECT COUNT(*) FROM community_comments WHERE memo_id = ?", (memo_id,))
+    return int(cursor.fetchone()[0] or 0)
+
+
+def _reaction_count(conn: sqlite3.Connection, memo_id: str) -> int:
+    cursor = conn.execute(
+        "SELECT COUNT(*) FROM community_reactions WHERE memo_id = ? AND reaction_type = ?",
+        (memo_id, UPVOTE_REACTION),
+    )
+    return int(cursor.fetchone()[0] or 0)
+
+
+def _liked_by_user(conn: sqlite3.Connection, memo_id: str, viewer_id: str = "") -> bool:
+    if not viewer_id:
+        return False
+    cursor = conn.execute(
+        """
+        SELECT 1
+        FROM community_reactions
+        WHERE memo_id = ? AND user_id = ? AND reaction_type = ?
+        LIMIT 1
+        """,
+        (memo_id, viewer_id, UPVOTE_REACTION),
+    )
+    return cursor.fetchone() is not None
+
+
+def list_comments(memo_id: str) -> list[dict]:
+    uid = _normalize_memo_id(memo_id)
+    conn = _get_conn()
+    try:
+        rows = conn.execute(
+            """
+            SELECT id, memo_id, user_id, content, created, updated
+            FROM community_comments
+            WHERE memo_id = ?
+            ORDER BY created ASC
+            """,
+            (uid,),
+        ).fetchall()
+        return [_comment_from_row(row) for row in rows]
+    finally:
+        conn.close()
+
+
+def _enrich_memo(conn: sqlite3.Connection, memo: dict, viewer_id: str = "", include_comments: bool = False) -> dict:
+    enriched = dict(memo)
+    enriched["comment_count"] = _comment_count(conn, memo["id"])
+    enriched["reaction_count"] = _reaction_count(conn, memo["id"])
+    enriched["liked_by_me"] = _liked_by_user(conn, memo["id"], viewer_id)
+    if include_comments:
+        enriched["comments"] = list_comments(memo["id"])
+    return enriched
+
+
+def _to_memo_format(memo: dict) -> dict:
+    payload = {
+        "name": f"memos/{memo['id']}",
+        "id": memo["id"],
+        "creator": f"users/{memo['user_id']}",
+        "user_id": memo["user_id"],
+        "content": memo["content"],
+        "pinned": memo["pinned"],
+        "visibility": memo["visibility"],
+        "state": memo["state"],
+        "create_time": memo["created"],
+        "update_time": memo["updated"],
+        "display_time": memo["created"],
+        "tags": memo["tags"],
+        "attachments": memo["attachments"],
+        "comment_count": memo["comment_count"],
+        "reaction_count": memo["reaction_count"],
+        "liked_by_me": memo["liked_by_me"],
+    }
+    if "comments" in memo:
+        payload["comments"] = memo["comments"]
+    return payload
+
+
+def _normalize_memo(memo: dict) -> dict:
+    payload = {
+        "id": memo["id"],
+        "user_id": memo["user_id"],
+        "content": memo["content"],
+        "pinned": memo["pinned"],
+        "visibility": memo["visibility"],
+        "state": memo["state"],
+        "created": memo["created"],
+        "updated": memo["updated"],
+        "tags": memo["tags"],
+        "attachments": memo["attachments"],
+        "comment_count": memo["comment_count"],
+        "reaction_count": memo["reaction_count"],
+        "liked_by_me": memo["liked_by_me"],
+    }
+    if "comments" in memo:
+        payload["comments"] = memo["comments"]
+    return payload
+
+
+def _build_where_clause(state: str = "NORMAL", query: str = "") -> tuple[str, list[str]]:
+    clauses: list[str] = []
+    params: list[str] = []
+
+    normalized_state = (state or "NORMAL").upper()
+    if normalized_state != "ALL":
+        clauses.append("state = ?")
+        params.append(normalized_state)
+
+    if query:
+        lowered = query.lower()
+        clauses.append("LOWER(content) LIKE ?")
+        params.append(f"%{lowered}%")
+
+    if not clauses:
+        return "", params
+    return f"WHERE {' AND '.join(clauses)}", params
+
+
+def list_memos(
+    page: int = 1,
+    per_page: int = 50,
+    state: str = "NORMAL",
+    order_by: str = "-pinned,-created",
+    memo_format: bool = False,
+    query: str = "",
+    viewer_id: str = "",
+) -> dict:
+    conn = _get_conn()
+    try:
+        order_clause = "pinned DESC, created DESC"
+        if "created" in order_by and "pinned" not in order_by:
+            order_clause = "created DESC"
+
+        offset = (page - 1) * per_page
+        where_clause, params = _build_where_clause(state=state, query=query)
+
+        total = int(
+            conn.execute(f"SELECT COUNT(*) FROM community_memos {where_clause}", params).fetchone()[0] or 0
+        )
+
+        rows = conn.execute(
+            f"""
+            SELECT id, user_id, content, pinned, visibility, state, created, updated
+            FROM community_memos
+            {where_clause}
+            ORDER BY {order_clause}
+            LIMIT ? OFFSET ?
+            """,
+            [*params, per_page, offset],
+        ).fetchall()
+
+        items = []
+        for row in rows:
+            enriched = _enrich_memo(conn, _base_memo_from_row(row), viewer_id=viewer_id)
+            items.append(_to_memo_format(enriched) if memo_format else _normalize_memo(enriched))
+
+        next_token = "" if len(items) < per_page else str(page + 1)
+        return {
+            "memos": items,
+            "items": items,
+            "totalItems": total,
+            "page": page,
+            "pageSize": per_page,
+            "next_page_token": next_token,
+        }
+    finally:
+        conn.close()
+
+
+def get_memo(memo_id: str, viewer_id: str = "", include_comments: bool = True) -> dict | None:
+    uid = _normalize_memo_id(memo_id)
+    conn = _get_conn()
+    try:
+        row = conn.execute(
+            """
+            SELECT id, user_id, content, pinned, visibility, state, created, updated
+            FROM community_memos
+            WHERE id = ?
+            """,
+            (uid,),
+        ).fetchone()
+        if not row:
+            return None
+
+        enriched = _enrich_memo(
+            conn,
+            _base_memo_from_row(row),
+            viewer_id=viewer_id,
+            include_comments=include_comments,
+        )
+        return _to_memo_format(enriched)
+    finally:
+        conn.close()
+
+
+def create_memo(
+    user_id: str,
+    content: str,
+    pinned: bool = False,
+    visibility: str = "PRIVATE",
+    state: str = "NORMAL",
+) -> dict:
+    content = (content or "").strip()
+    if not content:
+        raise ValueError("content cannot be empty")
+    if len(content) > 10000:
+        raise ValueError("content is too long")
+
+    memo_id = uuid.uuid4().hex[:16]
+    now = _now_iso()
+
+    conn = _get_conn()
+    try:
+        conn.execute(
+            """
+            INSERT INTO community_memos (id, user_id, content, pinned, visibility, state, created, updated)
+            VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+            """,
+            (memo_id, user_id, content, 1 if pinned else 0, visibility, state, now, now),
+        )
+        conn.commit()
+        memo = _enrich_memo(
+            conn,
+            {
+                "id": memo_id,
+                "user_id": user_id,
+                "content": content,
+                "pinned": pinned,
+                "visibility": visibility,
+                "state": state,
+                "created": now,
+                "updated": now,
+                "tags": _extract_tags(content),
+                "attachments": _extract_attachments(content),
+            },
+            viewer_id=user_id,
+        )
+        return _to_memo_format(memo)
+    finally:
+        conn.close()
+
+
+def update_memo(
+    memo_id: str,
+    user_id: str,
+    pinned: Optional[bool] = None,
+    content: Optional[str] = None,
+    visibility: Optional[str] = None,
+    state: Optional[str] = None,
+) -> dict | None:
+    uid = _normalize_memo_id(memo_id)
+    conn = _get_conn()
+    try:
+        row = conn.execute("SELECT * FROM community_memos WHERE id = ?", (uid,)).fetchone()
+        if not row:
+            return None
+
+        memo = _base_memo_from_row(row)
+        if memo["user_id"] != user_id:
+            return None
+
+        updates = []
+        params = []
+
+        if pinned is not None:
+            updates.append("pinned = ?")
+            params.append(1 if pinned else 0)
+        if content is not None:
+            content = content.strip()
+            if not content:
+                raise ValueError("content cannot be empty")
+            if len(content) > 10000:
+                raise ValueError("content is too long")
+            updates.append("content = ?")
+            params.append(content)
+        if visibility is not None:
+            updates.append("visibility = ?")
+            params.append(visibility)
+        if state is not None:
+            updates.append("state = ?")
+            params.append(state)
+
+        if not updates:
+            return _to_memo_format(_enrich_memo(conn, memo, viewer_id=user_id))
+
+        now = _now_iso()
+        updates.append("updated = ?")
+        params.append(now)
+        params.append(uid)
+        conn.execute(f"UPDATE community_memos SET {', '.join(updates)} WHERE id = ?", params)
+        conn.commit()
+
+        latest_content = content if content is not None else memo["content"]
+        memo.update(
+            {
+                "pinned": pinned if pinned is not None else memo["pinned"],
+                "content": latest_content,
+                "visibility": visibility if visibility is not None else memo["visibility"],
+                "state": state if state is not None else memo["state"],
+                "updated": now,
+                "tags": _extract_tags(latest_content),
+                "attachments": _extract_attachments(latest_content),
+            }
+        )
+        return _to_memo_format(_enrich_memo(conn, memo, viewer_id=user_id))
+    finally:
+        conn.close()
+
+
+def delete_memo(memo_id: str, user_id: str) -> bool:
+    uid = _normalize_memo_id(memo_id)
+    conn = _get_conn()
+    try:
+        row = conn.execute("SELECT user_id FROM community_memos WHERE id = ?", (uid,)).fetchone()
+        if not row or row["user_id"] != user_id:
+            return False
+        conn.execute("DELETE FROM community_memos WHERE id = ?", (uid,))
+        conn.commit()
+        return True
+    finally:
+        conn.close()
+
+
+def create_comment(memo_id: str, user_id: str, content: str) -> dict:
+    uid = _normalize_memo_id(memo_id)
+    content = (content or "").strip()
+    if not content:
+        raise ValueError("comment content cannot be empty")
+    if len(content) > 3000:
+        raise ValueError("comment content is too long")
+
+    conn = _get_conn()
+    try:
+        memo_exists = conn.execute("SELECT 1 FROM community_memos WHERE id = ?", (uid,)).fetchone()
+        if not memo_exists:
+            raise ValueError("memo does not exist")
+
+        comment_id = uuid.uuid4().hex[:16]
+        now = _now_iso()
+        conn.execute(
+            """
+            INSERT INTO community_comments (id, memo_id, user_id, content, created, updated)
+            VALUES (?, ?, ?, ?, ?, ?)
+            """,
+            (comment_id, uid, user_id, content, now, now),
+        )
+        conn.commit()
+        return {
+            "id": comment_id,
+            "memo_id": uid,
+            "user_id": user_id,
+            "content": content,
+            "created": now,
+            "updated": now,
+        }
+    finally:
+        conn.close()
+
+
+def delete_comment(comment_id: str, user_id: str) -> bool:
+    conn = _get_conn()
+    try:
+        row = conn.execute(
+            """
+            SELECT c.user_id AS comment_user_id, m.user_id AS memo_user_id
+            FROM community_comments c
+            JOIN community_memos m ON m.id = c.memo_id
+            WHERE c.id = ?
+            """,
+            (comment_id,),
+        ).fetchone()
+        if not row:
+            return False
+        if row["comment_user_id"] != user_id and row["memo_user_id"] != user_id:
+            return False
+        conn.execute("DELETE FROM community_comments WHERE id = ?", (comment_id,))
+        conn.commit()
+        return True
+    finally:
+        conn.close()
+
+
+def toggle_reaction(memo_id: str, user_id: str, reaction_type: str = UPVOTE_REACTION) -> dict:
+    uid = _normalize_memo_id(memo_id)
+    reaction_type = (reaction_type or UPVOTE_REACTION).upper()
+    conn = _get_conn()
+    try:
+        memo_exists = conn.execute("SELECT 1 FROM community_memos WHERE id = ?", (uid,)).fetchone()
+        if not memo_exists:
+            raise ValueError("memo does not exist")
+
+        existing = conn.execute(
+            """
+            SELECT id
+            FROM community_reactions
+            WHERE memo_id = ? AND user_id = ? AND reaction_type = ?
+            """,
+            (uid, user_id, reaction_type),
+        ).fetchone()
+
+        liked = False
+        if existing:
+            conn.execute("DELETE FROM community_reactions WHERE id = ?", (existing["id"],))
+        else:
+            conn.execute(
+                """
+                INSERT INTO community_reactions (id, memo_id, user_id, reaction_type, created)
+                VALUES (?, ?, ?, ?, ?)
+                """,
+                (uuid.uuid4().hex[:16], uid, user_id, reaction_type, _now_iso()),
+            )
+            liked = True
+        conn.commit()
+
+        return {
+            "memo_id": uid,
+            "reaction_type": reaction_type,
+            "liked": liked,
+            "reaction_count": _reaction_count(conn, uid),
+        }
+    finally:
+        conn.close()
+
+
+def save_upload(data: bytes, filename: str, content_type: str, user_id: str, base_url: str) -> dict:
+    _ensure_dirs()
+    ext = filename.rsplit(".", 1)[-1].lower() if "." in filename else "jpg"
+    if ext not in ("jpg", "jpeg", "png", "gif", "webp"):
+        ext = "jpg"
+
+    upload_id = uuid.uuid4().hex[:16]
+    stored_name = f"{int(time.time() * 1000)}_{upload_id[:8]}.{ext}"
+    path = UPLOADS_DIR / stored_name
+    path.write_bytes(data)
+
+    now = _now_iso()
+    url = f"{base_url.rstrip('/')}/community/files/{stored_name}"
+
+    conn = _get_conn()
+    try:
+        conn.execute(
+            """
+            INSERT INTO community_uploads (id, user_id, original_name, filename, content_type, size, url, created)
+            VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+            """,
+            (upload_id, user_id, filename, stored_name, content_type, len(data), url, now),
+        )
+        conn.commit()
+    finally:
+        conn.close()
+
+    return {
+        "id": upload_id,
+        "url": url,
+        "markdown": f"![{filename}]({url})",
+        "filename": stored_name,
+        "original_name": filename,
+        "content_type": content_type,
+        "size": len(data),
+        "created": now,
+    }
+
+
+def list_uploads(page: int = 1, per_page: int = 24, user_id: str = "") -> dict:
+    offset = (page - 1) * per_page
+    conn = _get_conn()
+    try:
+        where_clause = ""
+        params: list[str] = []
+        if user_id:
+            where_clause = "WHERE user_id = ?"
+            params.append(user_id)
+
+        total = int(
+            conn.execute(f"SELECT COUNT(*) FROM community_uploads {where_clause}", params).fetchone()[0] or 0
+        )
+        rows = conn.execute(
+            f"""
+            SELECT id, user_id, original_name, filename, content_type, size, url, created
+            FROM community_uploads
+            {where_clause}
+            ORDER BY created DESC
+            LIMIT ? OFFSET ?
+            """,
+            [*params, per_page, offset],
+        ).fetchall()
+
+        items = [
+            {
+                "id": row["id"],
+                "user_id": row["user_id"],
+                "filename": row["filename"],
+                "original_name": row["original_name"],
+                "content_type": row["content_type"],
+                "size": row["size"],
+                "url": row["url"],
+                "created": row["created"],
+            }
+            for row in rows
+        ]
+
+        next_token = "" if len(items) < per_page else str(page + 1)
+        return {
+            "items": items,
+            "totalItems": total,
+            "page": page,
+            "pageSize": per_page,
+            "next_page_token": next_token,
+        }
+    finally:
+        conn.close()
+
+
+def get_stats(member_count: int | None = None) -> dict:
+    conn = _get_conn()
+    try:
+        totals = conn.execute(
+            """
+            SELECT
+                COUNT(*) AS total_memos,
+                SUM(CASE WHEN state = 'NORMAL' THEN 1 ELSE 0 END) AS normal_memos,
+                SUM(CASE WHEN state = 'ARCHIVED' THEN 1 ELSE 0 END) AS archived_memos,
+                SUM(CASE WHEN pinned = 1 THEN 1 ELSE 0 END) AS pinned_memos,
+                COUNT(DISTINCT user_id) AS contributors
+            FROM community_memos
+            """
+        ).fetchone()
+
+        total_uploads = int(conn.execute("SELECT COUNT(*) FROM community_uploads").fetchone()[0] or 0)
+        total_comments = int(conn.execute("SELECT COUNT(*) FROM community_comments").fetchone()[0] or 0)
+        total_reactions = int(conn.execute("SELECT COUNT(*) FROM community_reactions").fetchone()[0] or 0)
+
+        today_prefix = _now_iso()[:10]
+        today_memos = int(
+            conn.execute("SELECT COUNT(*) FROM community_memos WHERE created LIKE ?", (f"{today_prefix}%",)).fetchone()[0]
+            or 0
+        )
+
+        top_authors_rows = conn.execute(
+            """
+            SELECT user_id, COUNT(*) AS memo_count, MAX(created) AS latest_created
+            FROM community_memos
+            WHERE state = 'NORMAL'
+            GROUP BY user_id
+            ORDER BY memo_count DESC, latest_created DESC
+            LIMIT 6
+            """
+        ).fetchall()
+        top_authors = [
+            {
+                "user_id": row["user_id"],
+                "memo_count": row["memo_count"],
+                "latest_created": row["latest_created"],
+            }
+            for row in top_authors_rows
+        ]
+
+        tag_counter: Counter[str] = Counter()
+        for row in conn.execute("SELECT content FROM community_memos WHERE state = 'NORMAL'").fetchall():
+            tag_counter.update(_extract_tags(row["content"]))
+
+        top_tags = [{"tag": tag, "count": count} for tag, count in tag_counter.most_common(10)]
+
+        latest_rows = conn.execute(
+            """
+            SELECT id, user_id, content, pinned, visibility, state, created, updated
+            FROM community_memos
+            WHERE state = 'NORMAL'
+            ORDER BY pinned DESC, created DESC
+            LIMIT 3
+            """
+        ).fetchall()
+        latest_memos = [_normalize_memo(_enrich_memo(conn, _base_memo_from_row(row))) for row in latest_rows]
+
+        return {
+            "stats": {
+                "members": member_count,
+                "total_memos": int(totals["total_memos"] or 0),
+                "normal_memos": int(totals["normal_memos"] or 0),
+                "archived_memos": int(totals["archived_memos"] or 0),
+                "pinned_memos": int(totals["pinned_memos"] or 0),
+                "contributors": int(totals["contributors"] or 0),
+                "attachments": total_uploads,
+                "comments": total_comments,
+                "reactions": total_reactions,
+                "today_memos": today_memos,
+            },
+            "top_tags": top_tags,
+            "top_authors": top_authors,
+            "latest_memos": latest_memos,
+        }
+    finally:
+        conn.close()
+
+
+def get_upload_path(filename: str) -> Path | None:
+    if not filename or ".." in filename or "/" in filename or "\\" in filename:
+        return None
+    path = UPLOADS_DIR / filename
+    if not path.exists() or not path.is_file():
+        return None
+    return path
diff --git a/app/main.py b/app/main.py
index 8b3dc59..4ac5a3a 100755
--- a/app/main.py
+++ b/app/main.py
@@ -30,6 +30,7 @@ from .routers import (
     legacy_router,
     common_router,
     meetup_router,
+    community_router,
 )
 
 app = FastAPI(
@@ -165,6 +166,7 @@ app.include_router(nomadlms_router)
 app.include_router(legacy_router)
 app.include_router(common_router)
 app.include_router(meetup_router)
+app.include_router(community_router)
 
 
 @app.get("/")
@@ -180,5 +182,6 @@ async def root():
             "nomadlms": "/nomadlms/payh5, ...",
             "legacy": "/payh5, /payh5/redirect, /zpay_notify, /xorpay_notify, /zpay_order_status",
             "common": "/submit_meetup_application, /create_user",
+            "community": "/community/memos, /community/stats, /community/attachments, /community/upload",
         },
     }
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index 955ed8c..bb4b95a 100644
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diff --git a/app/payment/__pycache__/zpay.cpython-312.pyc b/app/payment/__pycache__/zpay.cpython-312.pyc
index f5b00c9..0a31e87 100644
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diff --git a/app/routers/__init__.py b/app/routers/__init__.py
index 99afa37..52065d5 100644
--- a/app/routers/__init__.py
+++ b/app/routers/__init__.py
@@ -13,6 +13,7 @@ from .nomadlms import router as nomadlms_router
 from .legacy import router as legacy_router
 from .common import router as common_router
 from .meetup import router as meetup_router
+from .community import router as community_router
 
 __all__ = [
     "nomadvip_router",
@@ -22,4 +23,5 @@ __all__ = [
     "legacy_router",
     "common_router",
     "meetup_router",
+    "community_router",
 ]
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diff --git a/app/routers/community.py b/app/routers/community.py
new file mode 100644
index 0000000..968cb34
--- /dev/null
+++ b/app/routers/community.py
@@ -0,0 +1,359 @@
+"""
+Private community API.
+"""
+
+from __future__ import annotations
+
+from datetime import datetime
+import logging
+from typing import Any
+
+from fastapi import APIRouter, File, Form, HTTPException, UploadFile
+from fastapi.responses import FileResponse
+import requests
+
+from ..config import BASE_URL, PB_ADMIN_EMAIL, PB_ADMIN_PASSWORD, PB_URL
+from ..db import community_sqlite as sqlite_db
+from ..services import community as community_svc
+
+ALLOWED_IMAGE_TYPES = {"image/jpeg", "image/png", "image/gif", "image/webp"}
+MAX_IMAGE_SIZE = 10 * 1024 * 1024
+SITE_ID = "vip"
+
+router = APIRouter(prefix="/community", tags=["community"])
+logger = logging.getLogger(__name__)
+
+
+def _get_pb_admin_token() -> str | None:
+    if not PB_ADMIN_EMAIL or not PB_ADMIN_PASSWORD:
+        return None
+
+    base = (PB_URL or "").rstrip("/")
+    for path in (
+        "/api/collections/_superusers/auth-with-password",
+        "/api/admins/auth-with-password",
+    ):
+        try:
+            response = requests.post(
+                f"{base}{path}",
+                json={"identity": PB_ADMIN_EMAIL, "password": PB_ADMIN_PASSWORD},
+                timeout=10,
+            )
+            if response.status_code == 200:
+                return response.json().get("token")
+        except Exception:
+            continue
+    return None
+
+
+def _pb_escape(value: str) -> str:
+    return str(value).replace("\\", "\\\\").replace('"', '\\"')
+
+
+def _uid_has_vip(uid: str) -> bool:
+    uid = (uid or "").strip()
+    if not uid:
+        return False
+
+    token = _get_pb_admin_token()
+    if not token:
+        return False
+
+    base = (PB_URL or "").rstrip("/")
+    headers = {"Authorization": f"Bearer {token}"}
+    safe_uid = _pb_escape(uid)
+
+    try:
+        response = requests.get(
+            f"{base}/api/collections/site_vip/records",
+            params={"filter": f'user_id = "{safe_uid}" && site_id = "{SITE_ID}"', "perPage": 1},
+            headers=headers,
+            timeout=10,
+        )
+        if response.status_code == 200:
+            items = response.json().get("items") or []
+            if items:
+                record = items[0]
+                expires = record.get("expires_at") or ""
+                if not expires:
+                    return True
+                try:
+                    expires_at = datetime.fromisoformat(expires.replace("Z", "+00:00"))
+                    now = datetime.now(expires_at.tzinfo) if expires_at.tzinfo else datetime.now()
+                    return expires_at.timestamp() >= now.timestamp()
+                except Exception:
+                    return True
+    except Exception:
+        pass
+
+    try:
+        response = requests.get(
+            f"{base}/api/collections/payments/records",
+            params={"filter": f'user_id = "{safe_uid}" && type = "vip"', "sort": "-created", "perPage": 1},
+            headers=headers,
+            timeout=10,
+        )
+        if response.status_code == 200 and (response.json().get("items") or []):
+            return True
+    except Exception:
+        pass
+
+    return False
+
+
+def _count_vip_members() -> int | None:
+    token = _get_pb_admin_token()
+    if not token:
+        return None
+
+    base = (PB_URL or "").rstrip("/")
+    headers = {"Authorization": f"Bearer {token}"}
+
+    try:
+        response = requests.get(
+            f"{base}/api/collections/site_vip/records",
+            params={"filter": f'site_id = "{SITE_ID}"', "perPage": 1},
+            headers=headers,
+            timeout=10,
+        )
+        if response.status_code == 200:
+            payload = response.json()
+            return int(payload.get("totalItems") or len(payload.get("items") or []))
+    except Exception:
+        return None
+
+    return None
+
+
+def _require_vip_user(user_id: str, detail: str = "Only VIP members can access the private community.") -> str:
+    normalized = (user_id or "").strip()
+    if not normalized:
+        raise HTTPException(status_code=401, detail="Missing user_id")
+    if not _uid_has_vip(normalized):
+        raise HTTPException(status_code=403, detail=detail)
+    return normalized
+
+
+def _extract_payload(item: dict[str, Any]) -> dict[str, Any]:
+    nested = item.get("memo") or item.get("comment") or item.get("reaction")
+    if isinstance(nested, dict):
+        return nested
+    return item
+
+
+@router.get("/health")
+async def community_health():
+    return {"ok": True, "service": "community"}
+
+
+@router.get("/files/{filename:path}")
+async def serve_upload_file(filename: str):
+    path = sqlite_db.get_upload_path(filename)
+    if path is None:
+        raise HTTPException(status_code=404, detail="File not found.")
+    return FileResponse(path, filename=filename)
+
+
+@router.get("/stats")
+async def get_stats(user_id: str = ""):
+    normalized = _require_vip_user(user_id)
+    member_count = _count_vip_members()
+    return {"ok": True, "user_id": normalized, **community_svc.get_stats(member_count=member_count)}
+
+
+@router.get("/attachments")
+async def list_attachments(user_id: str = "", page: int = 1, per_page: int = 24):
+    _require_vip_user(user_id)
+    per_page = min(max(1, per_page), 60)
+    page = max(1, page)
+    return {"ok": True, **community_svc.list_uploads(page=page, per_page=per_page)}
+
+
+@router.get("/memos")
+async def list_memos(
+    user_id: str = "",
+    page: int = 1,
+    per_page: int = 50,
+    page_size: int = 0,
+    page_token: str = "",
+    state: str = "NORMAL",
+    order_by: str = "-pinned,-created",
+    memo_format: str = "1",
+    query: str = "",
+):
+    normalized = _require_vip_user(user_id)
+    per_page = per_page or page_size or 50
+    per_page = min(max(1, per_page), 100)
+    page = max(1, int(page_token) if page_token and page_token.isdigit() else page)
+
+    try:
+        result = community_svc.list_memos(
+            page=page,
+            per_page=per_page,
+            state=(state or "NORMAL").upper(),
+            order_by=order_by or "-pinned,-created",
+            memo_format=memo_format != "0",
+            query=(query or "").strip(),
+            viewer_id=normalized,
+        )
+        return {"ok": True, **result}
+    except RuntimeError as exc:
+        logger.error("community list_memos config error: %s", exc)
+        raise HTTPException(status_code=503, detail=str(exc))
+    except Exception as exc:
+        logger.error("community list_memos error: %s", exc)
+        raise HTTPException(status_code=500, detail=str(exc))
+
+
+@router.get("/memos/{memo_id}")
+async def get_memo(memo_id: str, user_id: str = ""):
+    normalized = _require_vip_user(user_id)
+    result = community_svc.get_memo(memo_id, viewer_id=normalized, include_comments=True)
+    if result is None:
+        raise HTTPException(status_code=404, detail="Memo not found.")
+    return {"ok": True, "memo": result}
+
+
+@router.post("/memos")
+async def create_memo(item: dict[str, Any]):
+    payload = _extract_payload(item)
+    user_id = _require_vip_user(payload.get("user_id") or item.get("user_id"), "Only VIP members can publish posts.")
+    content = str(payload.get("content") or item.get("content") or "").strip()
+    pinned = bool(payload.get("pinned") if payload.get("pinned") is not None else item.get("pinned"))
+    visibility = str(payload.get("visibility") or item.get("visibility") or "PRIVATE").upper()
+    state = str(payload.get("state") or item.get("state") or "NORMAL").upper()
+
+    try:
+        memo_record = community_svc.create_memo(
+            user_id=user_id,
+            content=content,
+            pinned=pinned,
+            visibility=visibility,
+            state=state,
+        )
+        return {"ok": True, "memo": memo_record}
+    except ValueError as exc:
+        raise HTTPException(status_code=400, detail=str(exc))
+    except RuntimeError as exc:
+        logger.error("community create_memo config error: %s", exc)
+        raise HTTPException(status_code=503, detail=str(exc))
+    except Exception as exc:
+        logger.error("community create_memo error: %s", exc)
+        raise HTTPException(status_code=500, detail=str(exc))
+
+
+@router.patch("/memos/{memo_id}")
+async def update_memo(memo_id: str, item: dict[str, Any]):
+    payload = _extract_payload(item)
+    user_id = _require_vip_user(payload.get("user_id") or item.get("user_id"), "Only VIP members can update posts.")
+
+    pinned = payload.get("pinned") if payload.get("pinned") is not None else item.get("pinned")
+    content = payload.get("content") if payload.get("content") is not None else item.get("content")
+    visibility = payload.get("visibility") or item.get("visibility")
+    state = payload.get("state") or item.get("state")
+
+    try:
+        result = community_svc.update_memo(
+            memo_id.replace("memos/", ""),
+            user_id,
+            pinned=bool(pinned) if pinned is not None else None,
+            content=str(content) if content is not None else None,
+            visibility=str(visibility).upper() if visibility else None,
+            state=str(state).upper() if state else None,
+        )
+    except ValueError as exc:
+        raise HTTPException(status_code=400, detail=str(exc))
+
+    if result is None:
+        raise HTTPException(status_code=404, detail="Memo not found or permission denied.")
+    return {"ok": True, "memo": result}
+
+
+@router.delete("/memos/{memo_id}")
+async def delete_memo(memo_id: str, user_id: str = ""):
+    normalized = _require_vip_user(user_id, "Only VIP members can delete posts.")
+    ok = community_svc.delete_memo(memo_id, normalized)
+    if not ok:
+        raise HTTPException(status_code=404, detail="Memo not found or permission denied.")
+    return {"ok": True}
+
+
+@router.get("/memos/{memo_id}/comments")
+async def get_comments(memo_id: str, user_id: str = ""):
+    _require_vip_user(user_id)
+    return {"ok": True, "comments": community_svc.list_comments(memo_id)}
+
+
+@router.post("/memos/{memo_id}/comments")
+async def create_comment(memo_id: str, item: dict[str, Any]):
+    payload = _extract_payload(item)
+    user_id = _require_vip_user(
+        payload.get("user_id") or item.get("user_id"),
+        "Only VIP members can reply in the private community.",
+    )
+    content = str(payload.get("content") or item.get("content") or "").strip()
+
+    try:
+        comment = community_svc.create_comment(memo_id, user_id, content)
+        return {"ok": True, "comment": comment}
+    except ValueError as exc:
+        raise HTTPException(status_code=400, detail=str(exc))
+    except Exception as exc:
+        logger.error("community create_comment error: %s", exc)
+        raise HTTPException(status_code=500, detail=str(exc))
+
+
+@router.delete("/comments/{comment_id}")
+async def delete_comment(comment_id: str, user_id: str = ""):
+    normalized = _require_vip_user(user_id, "Only VIP members can manage comments.")
+    ok = community_svc.delete_comment(comment_id, normalized)
+    if not ok:
+        raise HTTPException(status_code=404, detail="Comment not found or permission denied.")
+    return {"ok": True}
+
+
+@router.post("/memos/{memo_id}/reactions")
+async def toggle_reaction(memo_id: str, item: dict[str, Any]):
+    payload = _extract_payload(item)
+    user_id = _require_vip_user(
+        payload.get("user_id") or item.get("user_id"),
+        "Only VIP members can react in the private community.",
+    )
+    reaction_type = str(payload.get("reaction_type") or item.get("reaction_type") or sqlite_db.UPVOTE_REACTION)
+
+    try:
+        reaction = community_svc.toggle_reaction(memo_id, user_id, reaction_type)
+        return {"ok": True, "reaction": reaction}
+    except ValueError as exc:
+        raise HTTPException(status_code=400, detail=str(exc))
+    except Exception as exc:
+        logger.error("community toggle_reaction error: %s", exc)
+        raise HTTPException(status_code=500, detail=str(exc))
+
+
+@router.post("/upload")
+async def upload_image(user_id: str = Form(""), file: UploadFile = File(...)):
+    normalized = _require_vip_user(user_id, "Only VIP members can upload images.")
+
+    if not file.content_type or file.content_type.lower() not in ALLOWED_IMAGE_TYPES:
+        raise HTTPException(status_code=400, detail="Only jpeg, png, gif, and webp images are supported.")
+
+    data = await file.read()
+    if len(data) > MAX_IMAGE_SIZE:
+        raise HTTPException(status_code=400, detail="Image size must be 10MB or smaller.")
+
+    try:
+        base = (BASE_URL or "http://localhost:8000").rstrip("/")
+        result = community_svc.upload_image(
+            data=data,
+            filename=file.filename or "image",
+            content_type=file.content_type or "image/jpeg",
+            user_id=normalized,
+            base_url=base,
+        )
+        return {"ok": True, **result}
+    except RuntimeError as exc:
+        raise HTTPException(status_code=503, detail=str(exc))
+    except Exception as exc:
+        logger.error("community upload error: %s", exc)
+        raise HTTPException(status_code=500, detail=str(exc))
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diff --git a/app/services/community.py b/app/services/community.py
new file mode 100644
index 0000000..1cadf46
--- /dev/null
+++ b/app/services/community.py
@@ -0,0 +1,116 @@
+"""
+Private community service layer.
+"""
+
+from __future__ import annotations
+
+import logging
+import os
+
+from ..config import BASE_URL
+from ..db import community_sqlite as sqlite_db
+
+logger = logging.getLogger(__name__)
+
+try:
+    sqlite_db.init_schema()
+    logger.info("community: SQLite initialized at %s", sqlite_db.DB_PATH)
+except Exception as exc:
+    logger.warning("community SQLite init failed: %s", exc)
+
+
+def list_memos(
+    page: int = 1,
+    per_page: int = 50,
+    state: str = "NORMAL",
+    order_by: str = "-pinned,-created",
+    memo_format: bool = False,
+    query: str = "",
+    viewer_id: str = "",
+) -> dict:
+    return sqlite_db.list_memos(
+        page=page,
+        per_page=per_page,
+        state=state,
+        order_by=order_by,
+        memo_format=memo_format,
+        query=query,
+        viewer_id=viewer_id,
+    )
+
+
+def get_memo(memo_id: str, viewer_id: str = "", include_comments: bool = True) -> dict | None:
+    return sqlite_db.get_memo(memo_id, viewer_id=viewer_id, include_comments=include_comments)
+
+
+def create_memo(
+    user_id: str,
+    content: str,
+    pinned: bool = False,
+    visibility: str = "PRIVATE",
+    state: str = "NORMAL",
+) -> dict:
+    return sqlite_db.create_memo(
+        user_id=user_id,
+        content=content,
+        pinned=pinned,
+        visibility=visibility,
+        state=state,
+    )
+
+
+def update_memo(
+    memo_id: str,
+    user_id: str,
+    pinned: bool | None = None,
+    content: str | None = None,
+    visibility: str | None = None,
+    state: str | None = None,
+) -> dict | None:
+    return sqlite_db.update_memo(
+        memo_id,
+        user_id,
+        pinned=pinned,
+        content=content,
+        visibility=visibility,
+        state=state,
+    )
+
+
+def delete_memo(memo_id: str, user_id: str) -> bool:
+    return sqlite_db.delete_memo(memo_id, user_id)
+
+
+def create_comment(memo_id: str, user_id: str, content: str) -> dict:
+    return sqlite_db.create_comment(memo_id, user_id, content)
+
+
+def list_comments(memo_id: str) -> list[dict]:
+    return sqlite_db.list_comments(memo_id)
+
+
+def delete_comment(comment_id: str, user_id: str) -> bool:
+    return sqlite_db.delete_comment(comment_id, user_id)
+
+
+def toggle_reaction(memo_id: str, user_id: str, reaction_type: str = sqlite_db.UPVOTE_REACTION) -> dict:
+    return sqlite_db.toggle_reaction(memo_id, user_id, reaction_type)
+
+
+def upload_image(
+    data: bytes,
+    filename: str,
+    content_type: str,
+    user_id: str,
+    base_url: str = "",
+) -> dict:
+    base = base_url or (os.getenv("BASE_URL") or BASE_URL or "http://localhost:8000")
+    return sqlite_db.save_upload(data, filename, content_type, user_id, base)
+
+
+def list_uploads(page: int = 1, per_page: int = 24, user_id: str = "") -> dict:
+    return sqlite_db.list_uploads(page=page, per_page=per_page, user_id=user_id)
+
+
+def get_stats(member_count: int | None = None) -> dict:
+    return sqlite_db.get_stats(member_count=member_count)
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diff --git a/docs/COMMUNITY_MEMOS_SCHEMA.md b/docs/COMMUNITY_MEMOS_SCHEMA.md
new file mode 100644
index 0000000..91e81ae
--- /dev/null
+++ b/docs/COMMUNITY_MEMOS_SCHEMA.md
@@ -0,0 +1,21 @@
+# 私密社群 PocketBase 集合 schema
+
+在 PocketBase 管理后台创建集合 `community_memos`，字段如下：
+
+| 字段名 | 类型 | 必填 | 说明 |
+|--------|------|------|------|
+| user_id | Text | ✓ | 发布者 user_id（PocketBase 用户 ID 或匿名 user123456） |
+| content | Text | ✓ | 动态内容，支持 Markdown、#标签、图片 `![](url)` |
+| pinned | Bool | | 是否置顶，默认 false |
+| visibility | Text | | 可见性：PRIVATE/PROTECTED/PUBLIC，默认 PRIVATE |
+| state | Text | | 状态：NORMAL/ARCHIVED，默认 NORMAL |
+
+- 集合名：`community_memos`
+- 列表/查看权限：仅服务端 admin 操作，前端通过 payjsapi `/community/memos` 接口访问
+- 创建/更新/删除：仅 VIP 用户，由 payjsapi 校验
+
+创建步骤：
+1. 登录 PocketBase 管理后台
+2. Collections → New collection → 名称 `community_memos`
+3. 添加字段：user_id (Text), content (Editor 或 Text), pinned (Bool)
+4. 保存
diff --git a/docs/COMMUNITY_SQLITE.md b/docs/COMMUNITY_SQLITE.md
new file mode 100644
index 0000000..7e0dbb0
--- /dev/null
+++ b/docs/COMMUNITY_SQLITE.md
@@ -0,0 +1,45 @@
+# 社群模块 SQLite 存储
+
+默认使用 SQLite，无需 PocketBase、MinIO 等外部依赖。图片上传保存到本地目录。
+
+## 配置
+
+| 环境变量 | 说明 | 默认 |
+|----------|------|------|
+| COMMUNITY_STORAGE | `sqlite` \| `pocketbase` | `sqlite` |
+| COMMUNITY_DATA_DIR | 数据目录（含 db、uploads） | `./data` |
+| BASE_URL | 用于拼接图片 URL | 见主配置 |
+
+## 文件结构
+
+```
+data/
+├── community.db          # SQLite 数据库
+└── community_uploads/    # 上传图片
+    └── 1731234567_abc123.jpg
+```
+
+## 表结构（community_memos）
+
+| 字段 | 类型 | 说明 |
+|------|------|------|
+| id | TEXT | 主键 |
+| user_id | TEXT | 发布者 |
+| content | TEXT | 内容 |
+| pinned | INTEGER | 置顶 0/1 |
+| visibility | TEXT | PRIVATE/PROTECTED/PUBLIC |
+| state | TEXT | NORMAL/ARCHIVED |
+| created | TEXT | ISO 时间 |
+| updated | TEXT | ISO 时间 |
+
+## 启动时自动建表
+
+`app/services/community.py` 加载时自动执行 `init_schema()`，无需手动迁移。
+
+## 切换 PocketBase
+
+```bash
+COMMUNITY_STORAGE=pocketbase
+```
+
+需配置 PocketBase 和 MinIO（图片上传）。