fix: MSSQL migration 2.5.1

server/db/migrations/2.5.1.js

@@ -1,6 +1,27 @@
+/* global WIKI */
+
 exports.up = async knex => {
   await knex('authentication').where('isEnabled', false).del()
 
+  // -> Knex bug #3855 workaround
+  // -> https://github.com/knex/knex/pull/3855
+  if (WIKI.config.db.type === 'mssql') {
+    await knex.schema.raw(`
+      DECLARE @constraint varchar(100) = (SELECT default_constraints.name
+                                          FROM sys.all_columns
+                                          INNER JOIN sys.tables
+                                            ON all_columns.object_id = tables.object_id
+                                          INNER JOIN sys.schemas
+                                            ON tables.schema_id = schemas.schema_id
+                                          INNER JOIN sys.default_constraints
+                                            ON all_columns.default_object_id = default_constraints.object_id
+                                          WHERE schemas.name = 'dbo'
+                                          AND tables.name = 'authentication'
+                                          AND all_columns.name = 'isEnabled')
+
+      IF @constraint IS NOT NULL EXEC('ALTER TABLE authentication DROP CONSTRAINT ' + @constraint)`)
+  }
+
   await knex.schema
     .alterTable('authentication', table => {
       table.dropColumn('isEnabled')