fix: count stx mint data at block 0 towards account balances (#2289)

* fix: always treat block 0 boot data as canonical

* fix: tests

Author: rafaelcr

src/datastore/pg-write-store.ts

@@ -284,7 +284,9 @@ export class PgWriteStore extends PgStore {
       if ((await this.updateBlock(sql, data.block)) !== 0) {
         const q = new PgWriteQueue();
         q.enqueue(() => this.updateMinerRewards(sql, data.minerRewards));
-        if (isCanonical) {
+        // Block 0 is non-canonical, but we need to make sure its STX mint events get considered in
+        // balance calculations.
+        if (data.block.block_height == 0 || isCanonical) {
           // Use `data.txs` directly instead of `newTxData` for these STX/FT balance updates because
           // we don't want to skip balance changes in transactions that were previously confirmed
           // via microblocks.

tests/2.5/block-zero-handling.test.ts

@@ -175,5 +175,18 @@ describe('Block-zero event handling', () => {
     const firstMintEvent = mintTxEvents.filter(r => r.event_index === 0)[0];
     expect(firstMintEvent).toBeDefined();
     expect(firstMintEvent).toEqual(stxMintEvent);
+
+    // Compare balance endpoints for receiver address
+    const address = firstMintEvent.asset.recipient;
+    let result = await supertest(testEnv.api.server).get(`/extended/v1/address/${address}/stx`);
+    expect(result.status).toBe(200);
+    expect(result.type).toBe('application/json');
+    const v1balance = JSON.parse(result.text).balance;
+    result = await supertest(testEnv.api.server).get(
+      `/extended/v2/addresses/${address}/balances/stx`
+    );
+    expect(result.status).toBe(200);
+    expect(result.type).toBe('application/json');
+    expect(JSON.parse(result.text).balance).toBe(v1balance);
   });
 });