feat(api): add recent solves, yearly stats, and miss count to API

apps/api/src/srs.ts

@@ -310,6 +310,15 @@ export async function lookupProblems(
 export const DUE_WHERE = `stage != 'retired' AND next_review IS NOT NULL AND next_review <= ?1
     AND (defer_until IS NULL OR defer_until <= ?1)`;
 
+/**
+ * What an open miss means, in one place: a problem `p` whose most recent
+ * attempt (highest id) failed and that has not retired. The sweep day works
+ * these and the stats' "attempting" count is how many there are, so the two
+ * cannot disagree. Expects `problems p` joined to `attempts a` on lc_number.
+ */
+export const MISS_WHERE = `a.id = (SELECT MAX(id) FROM attempts WHERE lc_number = p.lc_number)
+    AND a.result = 'fail' AND p.stage != 'retired'`;
+
 /** Reviews due on/before `date`, oldest first — the overflow carry order. */
 export async function dueReviews(db: D1Database, date: string): Promise<ProblemRow[]> {
   const { results } = await db