fix(api): floor NFT price rolling average to keep wei strings BigInt-safe

.changeset/nouns-nft-price-bigint.md

@@ -0,0 +1,5 @@
+---
+"@anticapture/api": patch
+---
+
+Fix `/token/historical-data` returning 500 for NFT-priced DAOs (Nouns, Lil Nouns): the rolling-average SQL emitted decimal strings that crashed the wei-to-USD conversion, which in turn tripped the gateway circuit breaker and made the whole DAO unavailable.

apps/api/src/repositories/token/nft.ts

@@ -16,11 +16,15 @@ export class NFTPriceRepository {
   ): Promise<TokenHistoricalPriceResponse> {
     return await this.db
       .select({
+        // FLOOR keeps the value an integer wei string: AVG over NUMERIC emits
+        // decimal text (e.g. "200.5000000000000000"), which BigInt() rejects.
         price: sql<string>`
       CAST(
-        AVG(CAST(${tokenPrice.price} AS NUMERIC)) OVER (
-          ORDER BY ${tokenPrice.timestamp}
-          RANGE BETWEEN 2505600 PRECEDING AND CURRENT ROW
+        FLOOR(
+          AVG(CAST(${tokenPrice.price} AS NUMERIC)) OVER (
+            ORDER BY ${tokenPrice.timestamp}
+            RANGE BETWEEN 2505600 PRECEDING AND CURRENT ROW
+          )
         ) AS TEXT
       )
     `,

apps/api/src/repositories/token/nft.unit.test.ts

@@ -110,6 +110,26 @@ describe("NFTPriceRepository", () => {
 
       expect(result).toEqual([]);
     });
+
+    it("should return integer wei strings convertible to BigInt", async () => {
+      // AVG() over NUMERIC yields decimal text like "200.50000000000000000000";
+      // consumers convert this straight to BigInt, which rejects decimals.
+      await db
+        .insert(tokenPrice)
+        .values([
+          createTokenPrice({ timestamp: 1700000000n, price: 100n }),
+          createTokenPrice({ timestamp: 1700000100n, price: 301n }),
+        ]);
+
+      const result = await repository.getHistoricalNFTPrice(10, 0);
+
+      expect(result).toHaveLength(2);
+      for (const { price } of result) {
+        expect(() => BigInt(price)).not.toThrow();
+      }
+      expect(result[0]!.price).toBe("200");
+      expect(result[1]!.price).toBe("100");
+    });
   });
 
   describe("getTokenPrice", () => {