changed the auth approach to session id based

src/main/resources/db/migration/V2__create_sessions_table.sql

@@ -0,0 +1,13 @@
+-- Create sessions table for Bearer token authentication
+CREATE TABLE IF NOT EXISTS sessions (
+    id BIGINT AUTO_INCREMENT PRIMARY KEY,
+    session_id_hash VARCHAR(255) NOT NULL UNIQUE,
+    user_id BIGINT NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    expires_at TIMESTAMP NOT NULL,
+    INDEX idx_session_hash (session_id_hash),
+    INDEX idx_expires_at (expires_at),
+    INDEX idx_user_id (user_id),
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+