refactor(database): make session id the primary key in sessions table

server/modules/database/schema.ts

@@ -88,7 +88,7 @@ CREATE TABLE IF NOT EXISTS sessions (
     jsonl_path TEXT,
     created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
     updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-    PRIMARY KEY (session_id, provider),
+    PRIMARY KEY (session_id),
     FOREIGN KEY (project_path) REFERENCES projects(project_path)
     ON DELETE SET NULL
     ON UPDATE CASCADE