Some fixes for creation/editing of table columns.

packages/builder/src/components/backend/DataTable/modals/CreateEditColumn.svelte

@@ -51,12 +51,14 @@
   )
   $: required = !!field?.constraints?.presence || primaryDisplay
   $: uneditable =
-    $backendUiStore.selectedTable?._id === TableNames.USERS &&
-    UNEDITABLE_USER_FIELDS.includes(field.name)
+    ($backendUiStore.selectedTable?._id === TableNames.USERS &&
+    UNEDITABLE_USER_FIELDS.includes(field.name)) ||
+    (originalName && field.type === LINK_TYPE)
+
   $: invalid =
     (field.type === LINK_TYPE && !field.tableId) ||
     Object.keys($backendUiStore.draftTable.schema).some(
-      key => key === field.name
+      key => key === field.name && key !== originalName
     )
 
   // used to select what different options can be displayed for column type
@@ -162,19 +164,22 @@
     if (!linkTable) {
       return null
     }
-    const thisName = truncate(table.name, { length: 15 }),
-      linkName = truncate(linkTable.name, { length: 15 })
+    const thisName = truncate(table.name, { length: 14 }),
+      linkName = truncate(linkTable.name, { length: 14 })
     return [
       {
         name: `Many ${thisName} rows → many ${linkName} rows`,
+        alt: `Many ${table.name} rows → many ${linkTable.name} rows`,
         value: RelationshipTypes.MANY_TO_MANY,
       },
       {
         name: `One ${linkName} row → many ${thisName} rows`,
+        alt: `One ${linkTable.name} rows → many ${table.name} rows`,
         value: RelationshipTypes.ONE_TO_MANY,
       },
       {
         name: `One ${thisName} row → many ${linkName} rows`,
+        alt: `One ${table.name} rows → many ${linkTable.name} rows`,
         value: RelationshipTypes.MANY_TO_ONE,
       },
     ]
@@ -267,13 +272,13 @@
       <div>
         <Label grey extraSmall>Define the relationship</Label>
         <div class="radio-buttons">
-          {#each relationshipOptions as { value, name }}
+          {#each relationshipOptions as { value, name, alt }}
             <Radio
               disabled={originalName}
               name="Relationship type"
               {value}
               bind:group={field.relationshipType}>
-              <div class="radio-button-labels">
+              <div class="radio-button-labels" title={alt}>
                 <label for={value}>{name.split('→')[0]}</label>
                 <label class="rel-type-center" for={value}>→</label>
                 <label for={value}>{name.split('→')[1]}</label>