fix(sdk-core): decode accounts without created timestamps

CLAUDE.md

@@ -207,6 +207,7 @@ All generated or modified code **must** include JSDoc comments (`/** ... */`), c
 - `pnpm test` runs `npm run build` first (not `pnpm build`), then jest — the build must succeed before tests run
 - protoc-gen packages have `postinstall` scripts that trigger `pnpm dist` — this can be slow on first install
 - The `fix-hybrid-output.mjs` script must run after every build of hybrid packages or ESM imports will break in Node
+- Keep `AccountObject.created` optional: valid system-account responses may omit it.
 - `packages/sdk-core/src/contracts/sysio/authex` owns `sysio.authex` action builders, link table reads, and create-link proof helpers. Consumers should not duplicate the `createlink` message/signature rules locally.
 - AuthEx `links` reads use wire-sysio KV `index_name` queries with JSON-encoded bounds. Preserve KV row unwrapping, generated enum-name normalization, and compressed/uncompressed EM key equivalence.
 - `packages/sdk-core/src/contracts/sysio/reserv` owns public `sysio.reserv` registry reads, normalized rows, matching, rewards, and read-only quote helpers. External-chain reserve custody belongs in the ABI/IDL-owning chain SDK.

packages/sdk-core/README.md

@@ -2,6 +2,9 @@
 
 JavaScript library for working with Wire powered blockchains (formerly EOSIO, still compatible with EOSIO).
 
+The v1 account decoder accepts valid system-account responses that omit the
+optional `created` timestamp.
+
 Available on npm: <https://www.npmjs.com/package/@wireio/sdk-core>
 
 ## Multisig

packages/sdk-core/src/api/v1/Types.ts

@@ -152,8 +152,8 @@ export class AccountObject extends Struct {
   @Struct.field("bool") declare privileged: boolean
   /** Last update to accounts contract as unix timestamp. */
   @Struct.field("time_point") declare last_code_update: TimePoint
-  /** Account created as unix timestamp. */
-  @Struct.field("time_point") declare created: TimePoint
+  /** Account creation timestamp, omitted by some valid system-account responses. */
+  @Struct.field("time_point", { optional: true }) declare created: TimePoint | null
   /** Account core token balance */
   @Struct.field("asset?") core_liquid_balance?: Asset
   @Struct.field("int64") declare ram_quota: Int64

packages/sdk-core/tests/api/v1/Chain.test.ts

@@ -112,6 +112,31 @@ describe("ChainAPI.get_block", () => {
   })
 })
 
+describe("ChainAPI.get_account", () => {
+  test("decodes system accounts that omit the creation timestamp", async () => {
+    const client = makeClient({
+        "/v1/chain/get_account": {
+          account_name: "sysio",
+          head_block_num: 729126,
+          head_block_time: "2026-07-21T19:06:21.000",
+          privileged: true,
+          last_code_update: "2026-07-16T21:03:45.500",
+          ram_quota: 464220502,
+          net_weight: -1,
+          cpu_weight: -1,
+          net_limit: { used: -1, available: -1, max: -1 },
+          cpu_limit: { used: -1, available: -1, max: -1 },
+          ram_usage: 1745389,
+          permissions: []
+        }
+      }),
+      account = await client.v1.chain.get_account("sysio")
+
+    expect(account.account_name.toString()).toBe("sysio")
+    expect(account.created).toBeNull()
+  })
+})
+
 describe("ChainAPI.get_table_rows — wire-sysio KV row shape", () => {
   test("forwards named KV secondary-index bounds", async () => {
     const provider = new CapturingProvider(),