-- Audit log table for tracking user actions.
CREATE TABLE audit_log (
    id INTEGER PRIMARY KEY,
    user_id INTEGER,
    username TEXT NOT NULL,
    action TEXT NOT NULL,
    resource_type TEXT NOT NULL,
    resource_id TEXT,
    detail TEXT,
    remote_ip TEXT,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX idx_audit_log_created_at ON audit_log(created_at);
CREATE INDEX idx_audit_log_action ON audit_log(action);
CREATE INDEX idx_audit_log_resource ON audit_log(resource_type, resource_id);