diff --git a/src/config.schema.ts b/src/config.schema.ts
index 6a0f507..18abee4 100644
--- a/src/config.schema.ts
+++ b/src/config.schema.ts
@@ -288,6 +288,7 @@ export const envSchema = z
          .int()
          .positive()
          .default(1000),
+
    })
    .superRefine((data, ctx) => {
       if (data.MODE === 'production' && data.STELLAR_NETWORK === 'testnet') {
diff --git a/src/constants/error.constants.ts b/src/constants/error.constants.ts
index d285028..d027e18 100644
--- a/src/constants/error.constants.ts
+++ b/src/constants/error.constants.ts
@@ -4,6 +4,7 @@
  */
 export const ErrorCode = {
    VALIDATION_ERROR: 'VALIDATION_ERROR',
+   UNPROCESSABLE_ENTITY: 'UNPROCESSABLE_ENTITY',
    NOT_FOUND: 'NOT_FOUND',
    UNAUTHORIZED: 'UNAUTHORIZED',
    FORBIDDEN: 'FORBIDDEN',
diff --git a/src/modules/creator/creator.routes.ts b/src/modules/creator/creator.routes.ts
index 70a2a93..3db4342 100644
--- a/src/modules/creator/creator.routes.ts
+++ b/src/modules/creator/creator.routes.ts
@@ -74,7 +74,9 @@ creatorsRouter.post(
             'capBps must be between 100 and 2500'
          );
          return;
-      }
+      }         const keyId = Array.isArray(req.params.keyId)
+            ? req.params.keyId[0]
+            : req.params.keyId;
 
       const keyId = Array.isArray(req.params.keyId)
          ? req.params.keyId[0]
diff --git a/src/modules/indexer/price-snapshot-debug-log.unit.test.ts b/src/modules/indexer/price-snapshot-debug-log.unit.test.ts
index c5ee457..def9dfe 100644
--- a/src/modules/indexer/price-snapshot-debug-log.unit.test.ts
+++ b/src/modules/indexer/price-snapshot-debug-log.unit.test.ts
@@ -16,6 +16,9 @@ jest.mock('../../utils/prisma.utils', () => ({
          create: jest.fn(),
          update: jest.fn(),
       },
+      creatorPriceHistory: {
+         create: jest.fn(),
+      },
    },
 }));
 
@@ -34,6 +37,9 @@ const mockPrisma = prisma as unknown as {
       create: jest.Mock;
       update: jest.Mock;
    };
+   creatorPriceHistory: {
+      create: jest.Mock;
+   };
 };
 
 const mockLogger = logger as unknown as {
@@ -89,6 +95,67 @@ describe('#636 price snapshot write debug log', () => {
       expect(fields.previous_price).toBeNull();
    });
 
+   it('skips snapshot and history writes when the price is unchanged', async () => {
+      mockPrisma.creatorPriceSnapshot.findUnique.mockResolvedValue({
+         creatorId: CREATOR_ID,
+         currentPrice: BigInt(1_000_000),
+         price24hAgo: BigInt(900_000),
+         lastTradeAt: new Date('2026-01-01T00:00:00Z'),
+      });
+
+      await upsertPriceSnapshot({
+         creatorId: CREATOR_ID,
+         price: BigInt(1_000_000),
+         tradeAt: new Date('2026-01-02T00:00:00Z'),
+      });
+
+      expect(mockPrisma.creatorPriceSnapshot.update).not.toHaveBeenCalled();
+      expect(mockPrisma.creatorPriceHistory.create).not.toHaveBeenCalled();
+   });
+
+   it('writes a new snapshot and history record when the price changes', async () => {
+      mockPrisma.creatorPriceSnapshot.findUnique.mockResolvedValue({
+         creatorId: CREATOR_ID,
+         currentPrice: BigInt(1_000_000),
+         price24hAgo: BigInt(900_000),
+         lastTradeAt: new Date('2026-01-01T00:00:00Z'),
+      });
+      mockPrisma.creatorPriceSnapshot.update.mockResolvedValue({});
+      mockPrisma.creatorPriceHistory.create.mockResolvedValue({});
+
+      const tradeAt = new Date('2026-01-02T00:00:00Z');
+      await upsertPriceSnapshot({
+         creatorId: CREATOR_ID,
+         price: BigInt(1_100_000),
+         tradeAt,
+      });
+
+      expect(mockPrisma.creatorPriceSnapshot.update).toHaveBeenCalledTimes(1);
+      expect(mockPrisma.creatorPriceHistory.create).toHaveBeenCalledTimes(1);
+      expect(mockPrisma.creatorPriceHistory.create).toHaveBeenCalledWith({
+         data: {
+            creatorId: CREATOR_ID,
+            price: BigInt(1_100_000),
+            recordedAt: tradeAt,
+         },
+      });
+   });
+
+   it('writes the first snapshot when no previous snapshot exists', async () => {
+      mockPrisma.creatorPriceSnapshot.findUnique.mockResolvedValue(null);
+      mockPrisma.creatorPriceSnapshot.create.mockResolvedValue({});
+      mockPrisma.creatorPriceHistory.create.mockResolvedValue({});
+
+      await upsertPriceSnapshot({
+         creatorId: CREATOR_ID,
+         price: BigInt(1_000_000),
+         tradeAt: new Date('2026-01-01T00:00:00Z'),
+      });
+
+      expect(mockPrisma.creatorPriceSnapshot.create).toHaveBeenCalledTimes(1);
+      expect(mockPrisma.creatorPriceHistory.create).toHaveBeenCalledTimes(1);
+   });
+
    it('emits a debug log with the previous price on a subsequent (update) write', async () => {
       mockPrisma.creatorPriceSnapshot.findUnique.mockResolvedValue({
          creatorId: CREATOR_ID,