Add username/nickname history retention periods

backend/src/data/cleanup/nicknames.ts

@@ -0,0 +1,41 @@
+import { getRepository, In } from "typeorm";
+import moment from "moment-timezone";
+import { NicknameHistoryEntry } from "../entities/NicknameHistoryEntry";
+import { DAYS, DBDateFormat } from "../../utils";
+import { connection } from "../db";
+
+export const NICKNAME_RETENTION_PERIOD = 30 * DAYS;
+const CLEAN_PER_LOOP = 500;
+
+export async function cleanupNicknames(): Promise<number> {
+  let cleaned = 0;
+
+  const nicknameHistoryRepository = getRepository(NicknameHistoryEntry);
+  const dateThreshold = moment()
+    .subtract(NICKNAME_RETENTION_PERIOD, "ms")
+    .format(DBDateFormat);
+
+  // Clean old nicknames (NICKNAME_RETENTION_PERIOD)
+  let rows;
+  do {
+    rows = await connection.query(
+      `
+      SELECT id
+      FROM nickname_history
+      WHERE timestamp < ?
+      LIMIT ${CLEAN_PER_LOOP}
+    `,
+      [dateThreshold],
+    );
+
+    if (rows.length > 0) {
+      await nicknameHistoryRepository.delete({
+        id: In(rows.map(r => r.id)),
+      });
+    }
+
+    cleaned += rows.length;
+  } while (rows.length === CLEAN_PER_LOOP);
+
+  return cleaned;
+}