Remove dead defaultPollIntervalMinutes global setting

Confirmed dead: every source's pollIntervalMinutes is NOT NULL DEFAULT 15 and
the admin form only ever submits 5/15/60, so sourcesDueForPoll()'s fallback to
the global default could never actually trigger. Removes the setting end to
end (schema, settings.ts, scheduler/poller/sources signatures, admin types,
mock backend fixture) and drops the now-single-item "Poll interval" panel from
the Sources & Merge tab.

backend/src/ingestion/poller.ts

@@ -22,8 +22,8 @@ const adapters: Record<Source['type'], SourceAdapter> = {
 // as opposed to Telegram where the message itself *is* the content.
 const FOLLOWS_LINK_FOR_FULL_ARTICLE: Source['type'][] = ['rss', 'api'];
 
-export async function pollDueSources(defaultIntervalMinutes: number): Promise<number> {
-	const due = sourcesDb.sourcesDueForPoll(defaultIntervalMinutes);
+export async function pollDueSources(): Promise<number> {
+	const due = sourcesDb.sourcesDueForPoll();
 	let ingested = 0;
 	for (const source of due) {
 		ingested += await pollOne(source);

backend/src/queue/scheduler.ts

@@ -24,8 +24,7 @@ export function startScheduler() {
 
 	setInterval(async () => {
 		try {
-			const settings = settingsDb.getSettings();
-			const ingested = await pollDueSources(settings.defaultPollIntervalMinutes);
+			const ingested = await pollDueSources();
 			if (ingested > 0) logger.info('scheduler', `Poll tick: ingested ${ingested} new item(s)`);
 		} catch (err) {
 			logger.error('scheduler', `Poll tick failed: ${(err as Error).message}`);

backend/src/storage/db/index.ts

@@ -168,7 +168,6 @@ export function migrate() {
 		CREATE TABLE IF NOT EXISTS global_settings (
 			id INTEGER PRIMARY KEY CHECK (id = 1), -- singleton row
 			merge_strictness INTEGER NOT NULL DEFAULT 3,
-			default_poll_interval_minutes INTEGER NOT NULL DEFAULT 15,
 			hold_before_publish_minutes INTEGER NOT NULL DEFAULT 30,
 			tag_dedup_threshold REAL NOT NULL DEFAULT 0.82,
 			tag_expiry_days INTEGER NOT NULL DEFAULT 21,

backend/src/storage/db/settings.ts

@@ -4,7 +4,6 @@ import type { GlobalSettings } from './types.js';
 function rowToSettings(row: any): GlobalSettings {
 	return {
 		mergeStrictness: row.merge_strictness,
-		defaultPollIntervalMinutes: row.default_poll_interval_minutes,
 		holdBeforePublishMinutes: row.hold_before_publish_minutes,
 		tagDedupThreshold: row.tag_dedup_threshold,
 		tagExpiryDays: row.tag_expiry_days,
@@ -72,7 +71,7 @@ export function updateSettings(patch: Partial<GlobalSettings>): GlobalSettings {
 	// out of sync — node:sqlite binds each by its `$name` key, not position.
 	db.prepare(
 		`UPDATE global_settings SET
-			merge_strictness=$merge_strictness, default_poll_interval_minutes=$default_poll_interval_minutes,
+			merge_strictness=$merge_strictness,
 			hold_before_publish_minutes=$hold_before_publish_minutes,
 			tag_dedup_threshold=$tag_dedup_threshold, tag_expiry_days=$tag_expiry_days,
 			follow_up_min_hours_since_last=$follow_up_min_hours_since_last, follow_up_min_new_sources=$follow_up_min_new_sources,
@@ -90,7 +89,6 @@ export function updateSettings(patch: Partial<GlobalSettings>): GlobalSettings {
 		 WHERE id = 1`
 	).run({
 		$merge_strictness: merged.mergeStrictness,
-		$default_poll_interval_minutes: merged.defaultPollIntervalMinutes,
 		$hold_before_publish_minutes: merged.holdBeforePublishMinutes,
 		$tag_dedup_threshold: merged.tagDedupThreshold,
 		$tag_expiry_days: merged.tagExpiryDays,

backend/src/storage/db/sources.ts

@@ -89,12 +89,11 @@ export function markPolled(id: string, error: string | null) {
 	);
 }
 
-/** Sources due for polling right now, based on their own interval (or the global default). */
-export function sourcesDueForPoll(defaultIntervalMinutes: number): Source[] {
+/** Sources due for polling right now, based on their own interval. */
+export function sourcesDueForPoll(): Source[] {
 	const now = Date.now();
 	return listEnabledSources().filter((s) => {
 		if (!s.lastPolledAt) return true;
-		const interval = (s.pollIntervalMinutes || defaultIntervalMinutes) * 60_000;
-		return now - new Date(s.lastPolledAt).getTime() >= interval;
+		return now - new Date(s.lastPolledAt).getTime() >= s.pollIntervalMinutes * 60_000;
 	});
 }

backend/src/storage/db/types.ts

@@ -265,7 +265,6 @@ export interface Bookmark {
 
 export interface GlobalSettings {
 	mergeStrictness: 1 | 2 | 3 | 4 | 5;
-	defaultPollIntervalMinutes: number;
 	holdBeforePublishMinutes: number;
 	tagDedupThreshold: number;
 	tagExpiryDays: number;