Refactor to more consistent structure (e.g. "plugins")

plugins/nag/models.ts

@@ -0,0 +1,72 @@
+import {
+	BOOLEAN,
+	DATE,
+	INTEGER,
+	Model,
+	type Sequelize,
+	STRING,
+} from 'sequelize';
+
+export class Nag extends Model {
+    // Primary key
+    declare id: number;
+    // User who created this nag
+    declare userId: string;
+    // Guild (server) of original nag request
+    declare guildId: string;
+    // Channel of original nag request
+    declare channelId: string;
+    // Message of original nag request
+    declare messageId: string;
+    // Description of what you're supposed to do
+    declare text: string;
+    // Custom failure text
+    declare failText?: string;
+    // Should we @here?
+    declare mentionHere?: boolean;
+}
+
+export class CheckIn extends Model {
+    // Date of the last time user ran /checkin
+    declare lastCheckIn: Date;
+}
+
+export async function initializeModels(sequelize: Sequelize) {
+    Nag.init(
+        {
+            id: {
+                primaryKey: true,
+                type: INTEGER,
+                autoIncrement: true,
+            },
+            userId: {
+                type: STRING,
+                allowNull: false,
+            },
+            text: {
+                type: STRING,
+                allowNull: false,
+            },
+            failText: {
+                type: STRING,
+            },
+            mentionHere: {
+                type: BOOLEAN,
+            },
+        },
+        {sequelize},
+    );
+    CheckIn.init(
+        {
+            lastCheckIn: {
+                type: DATE,
+                allowNull: false,
+            },
+        },
+        {sequelize},
+    );
+    Nag.hasMany(CheckIn);
+    CheckIn.belongsTo(Nag);
+    await Nag.sync();
+    await CheckIn.sync();
+}