Initial work on stats

backend/src/data/GuildStats.ts

@@ -0,0 +1,30 @@
+import { BaseGuildRepository } from "./BaseGuildRepository";
+import { connection } from "./db";
+import { getRepository, Repository } from "typeorm";
+import { StatValue } from "./entities/StatValue";
+
+export class GuildStats extends BaseGuildRepository {
+  private stats: Repository<StatValue>;
+
+  constructor(guildId) {
+    super(guildId);
+    this.stats = getRepository(StatValue);
+  }
+
+  async saveValue(source: string, key: string, value: number): Promise<void> {
+    await this.stats.insert({
+      guild_id: this.guildId,
+      source,
+      key,
+      value,
+    });
+  }
+
+  async deleteOldValues(source: string, cutoff: string): Promise<void> {
+    await this.stats
+      .createQueryBuilder()
+      .where("source = :source", { source })
+      .andWhere("created_at < :cutoff", { cutoff })
+      .delete();
+  }
+}