src/lib/server/ledger/errors.ts

export class ConflictError extends Error {
	constructor(
		public readonly entityId: string,
		public readonly currentVersion: number
	) {
		super(`Entity ${entityId} was modified (current version ${currentVersion})`);
		this.name = 'ConflictError';
	}
}

export class NotFoundError extends Error {
	constructor(public readonly entityId: string) {
		super(`Entity ${entityId} not found`);
		this.name = 'NotFoundError';
	}
}

export class ReadOnlyError extends Error {
	constructor() {
		super('The app is in read-only mode: another instance holds the writer lock');
		this.name = 'ReadOnlyError';
	}
}