Tag functionality added

backend/app/database.py

@@ -2,6 +2,7 @@ import sqlite3
 import os
 from hashlib import sha256
 from pathlib import Path
+from uuid import uuid4
 
 BASE_DIR = Path(__file__).resolve().parent.parent
 DB_PATH = Path(os.getenv('LINKLOG_DATABASE_PATH', BASE_DIR / 'data' / 'linklog.db'))
@@ -13,6 +14,8 @@ AVATARS_DIR.mkdir(parents=True, exist_ok=True)
 def hash_password(password: str) -> str:
     return sha256(password.encode('utf-8')).hexdigest()
 
+DEFAULT_TAGS = ('#Internet', '#Cybersecurity', '#Fediverse', '#Food', '#Photography', '#Music', '#AI')
+
 MIGRATIONS = [
     (1, '''
 CREATE TABLE IF NOT EXISTS users (
@@ -71,6 +74,26 @@ CREATE TABLE IF NOT EXISTS user_plugin_config (
     UNIQUE(user_id, plugin_name),
     FOREIGN KEY(user_id) REFERENCES users(id)
 );
+'''),
+    (2, '''
+CREATE TABLE IF NOT EXISTS tags (
+    id TEXT PRIMARY KEY,
+    name TEXT NOT NULL UNIQUE,
+    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS link_tags (
+    link_id TEXT NOT NULL,
+    tag_id TEXT NOT NULL,
+    PRIMARY KEY (link_id, tag_id),
+    FOREIGN KEY(link_id) REFERENCES links(id) ON DELETE CASCADE,
+    FOREIGN KEY(tag_id) REFERENCES tags(id) ON DELETE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS idx_link_tags_tag_id ON link_tags(tag_id);
+'''),
+    (3, '''
+UPDATE tags SET name = '#' || name WHERE name NOT LIKE '#%';
 '''),
 ]
 
@@ -96,6 +119,14 @@ def apply_migrations(conn: sqlite3.Connection) -> None:
     conn.commit()
 
 
+def seed_default_tags(conn: sqlite3.Connection) -> None:
+    for tag in DEFAULT_TAGS:
+        conn.execute(
+            'INSERT OR IGNORE INTO tags (id, name) VALUES (?, ?)',
+            (str(uuid4()), tag),
+        )
+
+
 def init_db() -> None:
     with get_connection() as conn:
         apply_migrations(conn)
@@ -130,4 +161,5 @@ def init_db() -> None:
             ''',
             ('plugin-2', 'mastodon', '1.0.0', '{"enabled": true, "instance": "mastodon.social"}')
         )
+        seed_default_tags(conn)
         conn.commit()