diff --git a/packages/backend-defaults/config.d.ts b/packages/backend-defaults/config.d.ts
index b88671748e..8272bc5ca8 100644
--- a/packages/backend-defaults/config.d.ts
+++ b/packages/backend-defaults/config.d.ts
@@ -377,23 +377,29 @@ export interface Config {
     /** Database connection configuration, select base database type using the `client` field */
     database: {
       /** Default database client to use */
-      client: 'better-sqlite3' | 'sqlite3' | 'pg' | 'pg+google-cloudsql';
+      client: 'better-sqlite3' | 'sqlite3' | 'pg';
       /**
        * Base database connection string, or object with individual connection properties
        * @visibility secret
        */
       connection:
         | string
+        | {
+            /**
+             * The specific config for cloudsql connections
+             */
+            type: 'cloudsql';
+            /**
+             * The instance connection name for the cloudsql instance, e.g. `project:region:instance`
+             */
+            instance: string;
+          }
         | {
             /**
              * Password that belongs to the client User
              * @visibility secret
              */
             password?: string;
-            /**
-             * The instance connection name to use for google cloudsql connector. Should be format of `project:region:instance`
-             */
-            instance?: string;
             /**
              * Other connection settings
              */
@@ -440,28 +446,35 @@ export interface Config {
       plugin?: {
         [pluginId: string]: {
           /** Database client override */
-          client?: 'better-sqlite3' | 'sqlite3' | 'pg' | 'pg+google-cloudsql';
+          client?: 'better-sqlite3' | 'sqlite3' | 'pg';
           /**
            * Database connection string or Knex object override
            * @visibility secret
            */
           connection?:
             | string
+            | {
+                /**
+                 * The specific config for cloudsql connections
+                 */
+                type: 'cloudsql';
+                /**
+                 * The instance connection name for the cloudsql instance, e.g. `project:region:instance`
+                 */
+                instance: string;
+              }
             | {
                 /**
                  * Password that belongs to the client User
                  * @visibility secret
                  */
                 password?: string;
-                /**
-                 * The instance connection name to use for google cloudsql connector. Should be format of `project:region:instance`
-                 */
-                instance?: string;
                 /**
                  * Other connection settings
                  */
                 [key: string]: unknown;
               };
+
           /**
            * Whether to ensure the given database exists by creating it if it does not.
            * Defaults to base config if unspecified.
diff --git a/packages/backend-defaults/src/entrypoints/database/connectors/postgres.test.ts b/packages/backend-defaults/src/entrypoints/database/connectors/postgres.test.ts
index 71c6b882c7..2481004131 100644
--- a/packages/backend-defaults/src/entrypoints/database/connectors/postgres.test.ts
+++ b/packages/backend-defaults/src/entrypoints/database/connectors/postgres.test.ts
@@ -138,12 +138,13 @@ describe('postgres', () => {
       });
     });
 
-    it('uses the correct config when using pg+google-cloudsql', async () => {
+    it('uses the correct config when using cloudsql', async () => {
       expect(
         await buildPgDatabaseConfig(
           new ConfigReader({
-            client: 'pg+google-cloudsql',
+            client: 'pg',
             connection: {
+              type: 'cloudsql',
               user: 'ben@gke.com',
               instance: 'project:region:instance',
               port: 5423,
@@ -155,7 +156,6 @@ describe('postgres', () => {
         client: 'pg',
         connection: {
           user: 'ben@gke.com',
-          instance: 'project:region:instance',
           port: 5423,
           database: 'other_db',
         },
@@ -174,8 +174,9 @@ describe('postgres', () => {
       expect(
         await buildPgDatabaseConfig(
           new ConfigReader({
-            client: 'pg+google-cloudsql',
+            client: 'pg',
             connection: {
+              type: 'cloudsql',
               user: 'ben@gke.com',
               instance: 'project:region:instance',
               port: 5423,
@@ -187,7 +188,6 @@ describe('postgres', () => {
         client: 'pg',
         connection: {
           user: 'ben@gke.com',
-          instance: 'project:region:instance',
           port: 5423,
           stream: mockStream,
           database: 'other_db',
diff --git a/packages/backend-defaults/src/entrypoints/database/connectors/postgres.ts b/packages/backend-defaults/src/entrypoints/database/connectors/postgres.ts
index 66c1c0ffb2..b938d657a2 100644
--- a/packages/backend-defaults/src/entrypoints/database/connectors/postgres.ts
+++ b/packages/backend-defaults/src/entrypoints/database/connectors/postgres.ts
@@ -77,7 +77,7 @@ export async function buildPgDatabaseConfig(
     overrides,
   );
 
-  if (config.client === 'pg+google-cloudsql') {
+  if (config.connection?.type === 'cloudsql') {
     if (!config.connection.instance) {
       throw new Error('Missing instance connection name for Cloud SQL');
     }
@@ -94,7 +94,7 @@ export async function buildPgDatabaseConfig(
       authType: AuthTypes.IAM,
     });
 
-    return {
+    const cloudsqlConfig = {
       ...config,
       client: 'pg',
       connection: {
@@ -102,6 +102,12 @@ export async function buildPgDatabaseConfig(
         ...clientOpts,
       },
     };
+
+    // Trim additional properties from the connection object passed to knex
+    delete cloudsqlConfig.connection.type;
+    delete cloudsqlConfig.connection.instance;
+
+    return cloudsqlConfig;
   }
 
   return config;