Remove "locked" field from directus_fields

Closes #3925

api/src/database/migrations/20210304A-remove-locked-fields.ts

@@ -0,0 +1,13 @@
+import { Knex } from 'knex';
+
+export async function up(knex: Knex) {
+	await knex.schema.alterTable('directus_fields', (table) => {
+		table.dropColumn('locked');
+	});
+}
+
+export async function down(knex: Knex) {
+	await knex.schema.alterTable('directus_fields', (table) => {
+		table.boolean('locked').defaultTo(false).notNullable();
+	});
+}

api/src/database/seeds/04-fields.yaml

@@ -27,10 +27,6 @@ columns:
     length: 64
   display_options:
     type: json
-  locked:
-    type: boolean
-    default: false
-    nullable: false
   readonly:
     type: boolean
     default: false

api/src/database/system-data/fields/_defaults.yaml

@@ -5,7 +5,6 @@ interface: null
 options: null
 display: null
 display_options: null
-locked: false
 readonly: false
 hidden: false
 sort: null

api/src/database/system-data/fields/fields.yaml

@@ -40,12 +40,6 @@ fields:
     special: json
     width: half
 
-  - collection: directus_fields
-    field: locked
-    hidden: true
-    special: boolean
-    width: half
-
   - collection: directus_fields
     field: readonly
     hidden: true