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Backend/utils/default_queries.py

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+class PhotoQueries:
+    CREATE_TABLE = """
+        CREATE TABLE IF NOT EXISTS photos (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            user_id INTEGER NOT NULL,
+            album_name TEXT NOT NULL,
+            image_path TEXT NOT NULL,
+            title TEXT,
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
+        )
+    """
+
+    CREATE_COMMENTS_TABLE = """
+        CREATE TABLE IF NOT EXISTS photo_comments (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            photo_id INTEGER NOT NULL,
+            user_id INTEGER NOT NULL,
+            content TEXT NOT NULL,
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            FOREIGN KEY (photo_id) REFERENCES photos (id) ON DELETE CASCADE,
+            FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
+        )
+    """
+
+    INSERT_PHOTO = """
+        INSERT INTO photos (user_id, album_name, image_path, title, created_at)
+        VALUES (?, ?, ?, ?, ?)
+    """
+
+    SELECT_USER_PHOTOS = """
+        SELECT * FROM photos 
+        WHERE user_id = ?
+        ORDER BY created_at DESC 
+        LIMIT ? OFFSET ?
+    """
+
+    SELECT_USER_PHOTOS_BY_ALBUM = """
+        SELECT * FROM photos 
+        WHERE user_id = ? AND album_name = ?
+        ORDER BY created_at DESC 
+        LIMIT ? OFFSET ?
+    """
+
+    SELECT_LATEST_USER_PHOTO = """
+        SELECT * FROM photos WHERE user_id = ? ORDER BY id DESC LIMIT 1
+    """
+
+    SELECT_PHOTO_OWNER = """
+        SELECT user_id FROM photos WHERE id = ?
+    """
+
+    SELECT_PHOTO_ALBUM_NAME = """
+        SELECT album_name FROM photos WHERE id = ? AND user_id = ?
+    """
+
+    INSERT_COMMENT = """
+        INSERT INTO photo_comments (photo_id, user_id, content, created_at)
+        VALUES (?, ?, ?, ?)
+    """
+
+    SELECT_LATEST_COMMENT = """
+        SELECT * FROM photo_comments WHERE photo_id = ? AND user_id = ? ORDER BY id DESC LIMIT 1
+    """
+
+    SELECT_PHOTO_COMMENTS = """
+        SELECT pc.*, u.username 
+        FROM photo_comments pc
+        JOIN users u ON pc.user_id = u.id
+        WHERE pc.photo_id = ?
+        ORDER BY pc.created_at ASC
+    """
+
+    SELECT_PHOTO_BY_ID = """
+        SELECT * FROM photos WHERE id = ? AND user_id = ?
+    """
+
+    DELETE_PHOTO = """
+        DELETE FROM photos WHERE id = ? AND user_id = ?
+    """
+
+    UPDATE_PHOTO_PATH = """
+        UPDATE photos SET image_path = ? WHERE id = ? AND user_id = ?
+    """
+
+
+class LetterQueries:
+    CREATE_TABLE = """
+        CREATE TABLE IF NOT EXISTS letters (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            sender_id INTEGER NOT NULL,
+            content TEXT NOT NULL,
+            FOREIGN KEY (sender_id) REFERENCES users (id) ON DELETE CASCADE
+        )
+    """
+
+    INSERT_LETTER = """
+        INSERT INTO letters (sender_id, content)
+        VALUES (?, ?)
+    """
+
+    SELECT_USER_LETTERS = """
+        SELECT * FROM letters 
+        WHERE sender_id = ?
+    """
+
+    SELECT_LATEST_USER_LETTER = """
+        SELECT * FROM letters WHERE sender_id = ? LIMIT 1
+    """
+
+    SELECT_LETTER_BY_ID = """
+        SELECT * FROM letters WHERE id = ? AND sender_id = ?
+    """
+
+    SELECT_LETTER_FOR_DELIVERY = """
+        SELECT * FROM letters WHERE id = ?
+    """
+
+    SELECT_SENDER_USERNAME = """
+        SELECT username FROM users WHERE id = ?
+    """
+
+    UPDATE_LETTER = """
+        UPDATE letters SET content = ? WHERE id = ? AND sender_id = ?
+    """
+
+    DELETE_LETTER = """
+        DELETE FROM letters WHERE id = ? AND sender_id = ?
+    """
+
+
+class DatabaseIndexes:
+    USER_INDEXES = [
+        "CREATE INDEX IF NOT EXISTS idx_users_username ON users(username)",
+        "CREATE INDEX IF NOT EXISTS idx_users_email ON users(email)",
+    ]
+
+    DIARY_INDEXES = [
+        "CREATE INDEX IF NOT EXISTS idx_diaries_user_id ON diaries(user_id)",
+        "CREATE INDEX IF NOT EXISTS idx_diaries_category ON diaries(category)",
+        "CREATE INDEX IF NOT EXISTS idx_diaries_created_at ON diaries(created_at)",
+    ]
+
+    PHOTO_INDEXES = [
+        "CREATE INDEX IF NOT EXISTS idx_photos_user_id ON photos(user_id)",
+        "CREATE INDEX IF NOT EXISTS idx_photos_album ON photos(album_name)",
+        "CREATE INDEX IF NOT EXISTS idx_photo_comments_photo_id ON photo_comments(photo_id)",
+    ]
+
+    FRIENDSHIP_INDEXES = [
+        "CREATE INDEX IF NOT EXISTS idx_friendships_user_id ON friendships(user_id)",
+        "CREATE INDEX IF NOT EXISTS idx_friendships_friend_id ON friendships(friend_id)",
+        "CREATE INDEX IF NOT EXISTS idx_friendships_status ON friendships(status)",
+    ]
+
+    LETTER_INDEXES = [
+        "CREATE INDEX IF NOT EXISTS idx_letters_sender_id ON letters(sender_id)",
+        "CREATE INDEX IF NOT EXISTS idx_letters_sent_date ON letters(sent_date)",
+    ]
+
+    AVATAR_INDEXES = [
+        "CREATE INDEX IF NOT EXISTS idx_avatars_user_id ON avatars(user_id)",
+    ]
+
+    GUEST_BOOK_INDEXES = [
+        "CREATE INDEX IF NOT EXISTS idx_guest_books_user_id ON guest_books(user_id)",
+        "CREATE INDEX IF NOT EXISTS idx_guest_books_created_at ON guest_books(created_at)",
+    ]