add tier model

src/models/Tier.ts

@@ -0,0 +1,21 @@
+import { Document, Schema, model } from 'mongoose';
+
+export interface TierInterface extends Document {
+  id: number,
+  resourceLimits: {
+    // in MB
+    ram: number,
+    // in MB
+    storage: number,
+  },
+}
+
+const Tier: Schema = new Schema({
+  id: Number,
+  resourceLimits: {
+    ram: Number,
+    storage: Number,
+  },
+}, { id: false });
+
+export default model<TierInterface>('Tier', Tier);

src/models/index.ts

@@ -1,3 +1,4 @@
 export { default as Account, AccountInterface } from './Account';
 export { default as Moderation, ModerationInterface } from './Moderation';
 export { default as Domain, DomainInterface } from './Domain';
+export { default as Tier, TierInterface } from './Tier';