add task for purging stale pages with AfC templates

reports/afc-draft-purger.ts

@@ -0,0 +1,22 @@
+import {enwikidb} from "../db";
+import {arrayChunk} from "../utils";
+import {bot, log} from "../botbase";
+
+(async function () {
+
+    log(`[S] Started`)
+    const db = new enwikidb();
+    const [timeTaken, result] = await db.timedQuery(`
+        SELECT page_id FROM page
+        JOIN templatelinks ON tl_from = page_id
+            AND tl_target_id = (SELECT lt_id FROM linktarget WHERE lt_namespace = 10 AND lt_title = "AfC_submission")
+        JOIN revision ON rev_id = page_latest
+        WHERE page_namespace IN (2, 118)
+        AND rev_timestamp < DATE_FORMAT(UTC_DATE() - INTERVAL 5 MONTH, '%Y%m%d%H%i%S')
+        AND page_id NOT IN (SELECT cl_from FROM categorylinks WHERE cl_to = "AfC_G13_eligible_soon_submissions")
+    `);
+    log(`[S] Got query result in ${timeTaken.toFixed(2)} seconds: found ${result.length} pages to be purged`);
+    const batches = arrayChunk(result.map(row => row.page_id as number), 100);
+    await bot.seriesBatchOperation(batches, batch => bot.purge(batch), 10000, 2);
+
+})();

utils.ts

@@ -122,7 +122,7 @@ export function makeSentence(list: string[]) {
 	return text;
 }
 
-export function arrayChunk(arr, size) {
+export function arrayChunk<T>(arr: Array<T>, size: number): Array<Array<T>> {
 	var numChunks = Math.ceil(arr.length / size);
 	var result = new Array(numChunks);
 	for(var i = 0; i < numChunks; i++) {