perf: paginate docs list, lazy thumbnails, static cache headers

database/schema.py

@@ -46,6 +46,16 @@ def create_tables():
                 created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
             );
 
+            CREATE TABLE IF NOT EXISTS sessions (
+                id TEXT PRIMARY KEY,
+                user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+                username TEXT NOT NULL,
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                expires_at TIMESTAMP NOT NULL
+            );
+            CREATE INDEX IF NOT EXISTS idx_sessions_expires_at ON sessions(expires_at);
+            CREATE INDEX IF NOT EXISTS idx_sessions_user_id ON sessions(user_id);
+
             CREATE TABLE IF NOT EXISTS persons (
                 id INTEGER PRIMARY KEY AUTOINCREMENT,
                 first_name TEXT NOT NULL,