:fire: removing some unused vars | moving over some joi objects to schemas

backend/lib/models/grouping.js

 const Schwifty = require('@hapipal/schwifty')
 const groupingSchema = require('../schemas/groupings')
-const User = require('./user')
 const Profile = require('./profile')
 
 module.exports = class Grouping extends Schwifty.Model {

backend/lib/models/matchqueue.js

 const Schwifty = require('@hapipal/schwifty')
-const Joi = require('joi')
 const User = require('./user')
 const queueSchema = require('../schemas/queues')
 

backend/lib/models/membership.js

 const Schwifty = require('@hapipal/schwifty')
-const Joi = require('joi')
 const membershipSchema = require('../schemas/memberships')
 
 module.exports = class Membership extends Schwifty.Model {

backend/lib/models/tag-association.js

 const Schwifty = require('@hapipal/schwifty')
-const Joi = require('joi')
 
+const tagSchema = require('../schemas/tags')
 const Tag = require('./tag')
 
 module.exports = class TagAssociation extends Schwifty.Model {
         }
     }
     static get joiSchema() {
-        return Joi.object({
-            tag_association_id: Joi.number(),
-            profile_id: Joi.number(),
-            tag_id: Joi.number(),
-            is_deleted: Joi.bool(),
-        })
+        return tagSchema.association
     }
 }

backend/lib/models/tag.js

 const Schwifty = require('@hapipal/schwifty')
-const Joi = require('joi')
+const tagSchema = require('../schemas/tags')
 
 module.exports = class Tag extends Schwifty.Model {
     static get tableName() {
         return 'tags'
     }
     static get joiSchema() {
-        return Joi.object({
-            tag_id: Joi.number(),
-            tag_category: Joi.string(),
-            tag_description: Joi.string(),
-            is_active: Joi.bool(),
-        })
+        return tagSchema.single
     }
 }

backend/lib/routes/profile/get.js

 'use strict'
 
-const Joi = require('joi')
 const apiSchema = require('../../schemas/api')
 const errorSchema = require('../../schemas/errors')
 const profileSchema = require('../../schemas/profiles')

backend/lib/routes/profile/match.js

 'use strict'
 
-const Joi = require('joi')
 const apiSchema = require('../../schemas/api')
 const errorSchema = require('../../schemas/errors')
 const surveyResponseSchema = require('../../schemas/responses')