Type adjustment in MySQL columns

* TIMESTAMP type columns have been replaced by DATETIME. Depending on
the version of MySQL and SQL_MODE, the DBMS does not accept to create
TIMESTAMP NOT NULL columns without a default value;

packages/cli/src/databases/mysqldb/CredentialsEntity.ts

@@ -36,9 +36,9 @@ export class CredentialsEntity implements ICredentialsDb {
 	@Column('json')
 	nodesAccess: ICredentialNodeAccess[];
 
-	@Column('timestamp')
+	@Column('datetime')
 	createdAt: Date;
 
-	@Column('timestamp')
+	@Column('datetime')
 	updatedAt: Date;
 }

packages/cli/src/databases/mysqldb/ExecutionEntity.ts

@@ -36,10 +36,10 @@ export class ExecutionEntity implements IExecutionFlattedDb {
 	@Column({ nullable: true })
 	retrySuccessId: string;
 
-	@Column('timestamp')
+	@Column('datetime')
 	startedAt: Date;
 
-	@Column('timestamp')
+	@Column('datetime')
 	stoppedAt: Date;
 
 	@Column('json')

packages/cli/src/databases/mysqldb/WorkflowEntity.ts

@@ -35,10 +35,10 @@ export class WorkflowEntity implements IWorkflowDb {
 	@Column('json')
 	connections: IConnections;
 
-	@Column('timestamp')
+	@Column('datetime')
 	createdAt: Date;
 
-	@Column('timestamp')
+	@Column('datetime')
 	updatedAt: Date;
 
 	@Column({