fix(Postgres Node): Close connection pool only if it's not already closed or closing (#8690)

packages/nodes-base/nodes/Postgres/v2/actions/router.ts

@@ -58,7 +58,7 @@ export async function router(this: IExecuteFunctions): Promise<INodeExecutionDat
 			sshClient.end();
 		}
 
-		await db.$pool.end();
+		if (!db.$pool.ending) await db.$pool.end();
 	}
 
 	return [returnData];

packages/nodes-base/nodes/Postgres/v2/methods/listSearch.ts

@@ -23,7 +23,7 @@ export async function schemaSearch(this: ILoadOptionsFunctions): Promise<INodeLi
 		if (sshClient) {
 			sshClient.end();
 		}
-		await db.$pool.end();
+		if (!db.$pool.ending) await db.$pool.end();
 	}
 }
 export async function tableSearch(this: ILoadOptionsFunctions): Promise<INodeListSearchResult> {
@@ -54,6 +54,6 @@ export async function tableSearch(this: ILoadOptionsFunctions): Promise<INodeLis
 		if (sshClient) {
 			sshClient.end();
 		}
-		await db.$pool.end();
+		if (!db.$pool.ending) await db.$pool.end();
 	}
 }

packages/nodes-base/nodes/Postgres/v2/methods/loadOptions.ts

@@ -31,7 +31,7 @@ export async function getColumns(this: ILoadOptionsFunctions): Promise<INodeProp
 		if (sshClient) {
 			sshClient.end();
 		}
-		await db.$pool.end();
+		if (!db.$pool.ending) await db.$pool.end();
 	}
 }
 

packages/nodes-base/nodes/Postgres/v2/methods/resourceMapping.ts

@@ -94,6 +94,6 @@ export async function getMappingColumns(
 		if (sshClient) {
 			sshClient.end();
 		}
-		await db.$pool.end();
+		if (!db.$pool.ending) await db.$pool.end();
 	}
 }