|  | @@ -189,24 +189,35 @@ module.exports = () => {
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				|  |  |        ])
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				|  |  |  
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				|  |  |        // Truncate tables (reset from previous failed install)
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				|  |  | -      if (WIKI.config.db.type !== 'mssql') {
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				|  |  | -        await WIKI.models.locales.query().truncate()
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				|  |  | -        await WIKI.models.groups.query().truncate()
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				|  |  | -        await WIKI.models.users.query().truncate()
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				|  |  | -        await WIKI.models.navigation.query().truncate()
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				|  |  | -      } else {
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				|  |  | -        await WIKI.models.locales.query().del()
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				|  |  | -        await WIKI.models.groups.query().del()
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				|  |  | -        await WIKI.models.users.query().del()
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				|  |  | -        await WIKI.models.navigation.query().truncate()
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				|  |  | -        await WIKI.models.knex.raw(`
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				|  |  | -          IF EXISTS (SELECT * FROM sys.identity_columns WHERE OBJECT_NAME(OBJECT_ID) = 'groups' AND last_value IS NOT NULL)
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				|  |  | -            DBCC CHECKIDENT ([groups], RESEED, 0)
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				|  |  | -        `)
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				|  |  | -        await WIKI.models.knex.raw(`
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				|  |  | -          IF EXISTS (SELECT * FROM sys.identity_columns WHERE OBJECT_NAME(OBJECT_ID) = 'users' AND last_value IS NOT NULL)
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				|  |  | -            DBCC CHECKIDENT ([users], RESEED, 0)
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				|  |  | -        `)
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				|  |  | +      await WIKI.models.locales.query().where('code', '!=', 'x').del()
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				|  |  | +      await WIKI.models.navigation.query().truncate()
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				|  |  | +      switch (WIKI.config.db.type) {
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				|  |  | +        case 'postgres':
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				|  |  | +          await WIKI.models.knex.raw('TRUNCATE groups, users CASCADE')
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				|  |  | +          break
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				|  |  | +        case 'mysql':
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				|  |  | +        case 'mariadb':
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				|  |  | +          await WIKI.models.groups.query().where('id', '>', 0).del()
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				|  |  | +          await WIKI.models.users.query().where('id', '>', 0).del()
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				|  |  | +          await WIKI.models.knex.raw('ALTER TABLE groups AUTO_INCREMENT = 1')
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				|  |  | +          await WIKI.models.knex.raw('ALTER TABLE users AUTO_INCREMENT = 1')
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				|  |  | +          break
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				|  |  | +        case 'mssql':
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				|  |  | +          await WIKI.models.groups.query().del()
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				|  |  | +          await WIKI.models.users.query().del()
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				|  |  | +          await WIKI.models.knex.raw(`
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				|  |  | +            IF EXISTS (SELECT * FROM sys.identity_columns WHERE OBJECT_NAME(OBJECT_ID) = 'groups' AND last_value IS NOT NULL)
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				|  |  | +              DBCC CHECKIDENT ([groups], RESEED, 0)
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				|  |  | +          `)
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				|  |  | +          await WIKI.models.knex.raw(`
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				|  |  | +            IF EXISTS (SELECT * FROM sys.identity_columns WHERE OBJECT_NAME(OBJECT_ID) = 'users' AND last_value IS NOT NULL)
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				|  |  | +              DBCC CHECKIDENT ([users], RESEED, 0)
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				|  |  | +          `)
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				|  |  | +          break
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				|  |  | +        case 'sqlite':
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				|  |  | +          await WIKI.models.groups.query().truncate()
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				|  |  | +          await WIKI.models.users.query().truncate()
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				|  |  | +          break
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				|  |  |        }
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				|  |  |  
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				|  |  |        // Create default locale
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