Consolidate server utilities into shared module

- Add lib/server/utils/normalize.ts with normalizeTicker, normalizeTagsOrNull, nowIso, todayIso
- Add lib/server/utils/validation.ts with asRecord, asBoolean, asStringArray, asEnum
- Add lib/server/utils/index.ts re-exporting all utilities
- Remove duplicate lib/server/utils.ts (old file)
- Update all repos and files to use shared utilities
- Remove redundant ?? '' from normalizeTicker calls
- Update watchlist.ts to use normalizeTagsOrNull for null-return tags

lib/server/repos/filings.ts

@@ -2,6 +2,7 @@ import { desc, eq, inArray, max } from 'drizzle-orm';
 import type { Filing } from '@/lib/types';
 import { db } from '@/lib/server/db';
 import { filing, filingLink } from '@/lib/server/db/schema';
+import { normalizeTicker, nowIso } from '@/lib/server/utils';
 
 type FilingRow = typeof filing.$inferSelect;
 
@@ -90,7 +91,7 @@ export async function getFilingByAccession(accessionNumber: string) {
 export async function listLatestFilingDatesByTickers(tickers: string[]) {
   const normalizedTickers = [...new Set(
     tickers
-      .map((ticker) => ticker.trim().toUpperCase())
+      .map((ticker) => normalizeTicker(ticker))
       .filter((ticker) => ticker.length > 0)
   )];
 
@@ -121,7 +122,7 @@ export async function upsertFilingsRecords(items: UpsertFilingInput[]) {
   let updated = 0;
 
   for (const item of items) {
-    const now = new Date().toISOString();
+    const now = nowIso();
 
     const existing = await getFilingByAccession(item.accession_number);
 
@@ -192,7 +193,7 @@ export async function saveFilingAnalysis(
     .update(filing)
     .set({
       analysis,
-      updated_at: new Date().toISOString()
+      updated_at: nowIso()
     })
     .where(eq(filing.accession_number, accessionNumber))
     .returning();
@@ -208,7 +209,7 @@ export async function updateFilingMetricsById(
     .update(filing)
     .set({
       metrics,
-      updated_at: new Date().toISOString()
+      updated_at: nowIso()
     })
     .where(eq(filing.id, filingId))
     .returning();