allow changing source id but resets patterns

frontend/apps/web/app/(mgmt)/[account]/jobs/[id]/source/components/PiiDetectConnectionCard.tsx

@@ -170,9 +170,20 @@ export default function PiiDetectConnectionCard({
     <form onSubmit={onSubmit} className="space-y-6">
       <SourceConnectionId
         value={formData.sourceId}
-        onChange={(value) => setFormData({ ...formData, sourceId: value })}
+        onChange={(value) =>
+          setFormData({
+            ...formData,
+            sourceId: value,
+            tableScanFilter: {
+              ...formData.tableScanFilter,
+              patterns: {
+                schemas: [],
+                tables: [],
+              },
+            },
+          })
+        }
         error={errors['sourceId']}
-        isDisabled={true}
       />
       <UserPrompt
         value={formData.userPrompt ?? ''}

frontend/apps/web/app/(mgmt)/[account]/new/job/piidetect/schema/FormInputs.tsx

@@ -37,13 +37,12 @@ interface SourceConnectionIdProps {
   error?: string;
   value: string;
   onChange(value: string): void;
-  isDisabled?: boolean;
 }
 
 export function SourceConnectionId(
   props: SourceConnectionIdProps
 ): ReactElement {
-  const { error, value, onChange, isDisabled } = props;
+  const { error, value, onChange } = props;
 
   const { account } = useAccount();
   const {
@@ -81,7 +80,6 @@ export function SourceConnectionId(
           }
           onChange(value);
         }}
-        disabled={isDisabled}
       >
         <SelectTrigger>
           <SelectValue placeholder="Select a source connection" />