Fix app stream/timeline ordering desync and init lifecycle race (#73)

* fix(app): enforce canonical stream sequencing and init resolution * refactor: extract timeline and stream reducers to pure functions
2026-02-23 19:30:48 +07:00
parent 9b6f5e028c
commit a134132418
12 changed files with 1732 additions and 109 deletions
@@ -0,0 +1,38 @@
+export type SessionTimelineSeqCursor =
+  | {
+      epoch: string;
+      endSeq: number;
+    }
+  | null
+  | undefined;
+
+export type SessionTimelineSeqDecision =
+  | "accept"
+  | "drop_stale"
+  | "drop_epoch"
+  | "gap"
+  | "init";
+
+export function classifySessionTimelineSeq({
+  cursor,
+  epoch,
+  seq,
+}: {
+  cursor: SessionTimelineSeqCursor;
+  epoch: string;
+  seq: number;
+}): SessionTimelineSeqDecision {
+  if (!cursor) {
+    return "init";
+  }
+  if (cursor.epoch !== epoch) {
+    return "drop_epoch";
+  }
+  if (seq <= cursor.endSeq) {
+    return "drop_stale";
+  }
+  if (seq === cursor.endSeq + 1) {
+    return "accept";
+  }
+  return "gap";
+}