Review read-replica consistency

src/account-store-types.tsTypeScript
@@ -0,0 +1,21 @@
1+export interface Account {
2+ id: string;
3+ displayName: string;
4+}
5+
6+export interface PositionedAccount {
7+ account: Account;
8+ position: string;
9+}
10+
11+export interface AccountStores {
12+ primary: {
13+ update(id: string, displayName: string): Promise<{ position: string }>;
14+ read(id: string): Promise<PositionedAccount>;
15+ };
16+ replica: {
17+ position(): Promise<string>;
18+ waitUntil(position: string, timeoutMs: number): Promise<boolean>;
19+ read(id: string): Promise<PositionedAccount>;
20+ };
21+}