Add MessageSaver plugin. Fix some buggy queries.

src/data/entities/SavedMessage.ts

@@ -0,0 +1,33 @@
+import { Entity, Column, PrimaryColumn } from "typeorm";
+import { Message } from "eris";
+
+export interface ISavedMessageData {
+  attachments: object[];
+  author: {
+    username: string;
+    discriminator: string;
+  };
+  content: string;
+  embeds: object[];
+}
+
+@Entity("messages")
+export class SavedMessage {
+  @Column()
+  @PrimaryColumn()
+  id: string;
+
+  @Column() guild_id: string;
+
+  @Column() channel_id: string;
+
+  @Column() user_id: string;
+
+  @Column() is_bot: boolean;
+
+  @Column("simple-json") data: ISavedMessageData;
+
+  @Column() posted_at: string;
+
+  @Column() deleted_at: string;
+}