Implement unique constraint support (#4467)

* Allow creating unique fields

* Allow removing unique constriant

* Show unique constraint error as validation error in app

app/src/modules/settings/routes/data-model/field-detail/components/schema.vue

@@ -1,6 +1,5 @@
 <template>
 	<div>
-
 		<div class="form">
 			<div class="field">
 				<div class="label type-label">
@@ -139,6 +138,16 @@
 					block
 				/>
 			</div>
+
+			<div class="field half-right" v-if="fieldData.schema">
+				<div class="label type-label">{{ $t('unique') }}</div>
+				<v-checkbox
+					:input-value="fieldData.schema.is_unique"
+					@change="fieldData.schema.is_unique = $event"
+					:label="$t('value_unique')"
+					block
+				/>
+			</div>
 		</div>
 	</div>
 </template>

app/src/modules/settings/routes/data-model/field-detail/store.ts

@@ -43,6 +43,7 @@ function initLocalStore(collection: string, field: string, type: typeof localTyp
 				default_value: undefined,
 				max_length: undefined,
 				is_nullable: true,
+				is_unique: false,
 				numeric_precision: null,
 				numeric_scale: null,
 			},