drop lastCommunicatedAt of instance

packages/backend/src/models/entities/Instance.ts

@@ -75,12 +75,6 @@ export class Instance {
 	})
 	public latestRequestReceivedAt: Date | null;
 
-	/**
-	 * このインスタンスと最後にやり取りした日時
-	 */
-	@Column('timestamp with time zone')
-	public lastCommunicatedAt: Date;
-
 	/**
 	 * このインスタンスと不通かどうか
 	 */

packages/backend/src/models/schema/federation-instance.ts

@@ -32,11 +32,6 @@ export const packedFederationInstanceSchema = {
 			type: 'number',
 			optional: false, nullable: false,
 		},
-		lastCommunicatedAt: {
-			type: 'string',
-			optional: false, nullable: false,
-			format: 'date-time',
-		},
 		isNotResponding: {
 			type: 'boolean',
 			optional: false, nullable: false,