diff --git a/lib/contracts/constants.ts b/lib/contracts/constants.ts
index 69d4db8b..36352e17 100644
--- a/lib/contracts/constants.ts
+++ b/lib/contracts/constants.ts
@@ -24,14 +24,14 @@ export const EXPLORER_URL = IS_TESTNET
 // PlotLink contracts
 // ---------------------------------------------------------------------------
 
-/** Deployment block for the v4 StoryFactory (J-curve + real PLOT) on Base mainnet */
-export const DEPLOYMENT_BLOCK = BigInt(43_824_790);
+/** Deployment block for the v4b StoryFactory (symbol-collision fix) on Base mainnet */
+export const DEPLOYMENT_BLOCK = BigInt(43_840_298);
 
 /** StoryFactory — storyline + plot management */
 export const STORY_FACTORY = (process.env.NEXT_PUBLIC_CONTRACT_ADDRESS ??
   (IS_TESTNET
     ? "0xfa5489b6710Ba2f8406b37fA8f8c3018e51FA229"
-    : "0x92c3bd44fda84e632c3c3cb31387d0c0c1de618d")) as `0x${string}`;
+    : "0x9D2AE1E99D0A6300bfcCF41A82260374e38744Cf")) as `0x${string}`;
 
 /** ZapPlotLinkV2 — one-click buy (ETH/USDC/HUNT -> PLOT -> storyline token via Uniswap V4 + MCV2)
  *  Testnet: disabled (V1 contract incompatible with V2 ABI) */
diff --git a/packages/sdk/src/constants.ts b/packages/sdk/src/constants.ts
index bb40033d..739e0aa2 100644
--- a/packages/sdk/src/constants.ts
+++ b/packages/sdk/src/constants.ts
@@ -26,7 +26,7 @@ export const DEPLOYMENT_BLOCK = BigInt(20_000_000);
  * Deployment block for PlotLink contracts on Base mainnet.
  * Used as the default fromBlock for mainnet event log queries.
  */
-export const DEPLOYMENT_BLOCK_MAINNET = BigInt(43_824_790);
+export const DEPLOYMENT_BLOCK_MAINNET = BigInt(43_840_298);
 
 /** Supported chain IDs for the PlotLink SDK. */
 export const SUPPORTED_CHAIN_IDS = new Set([BASE_SEPOLIA_CHAIN_ID, BASE_MAINNET_CHAIN_ID]);
@@ -41,7 +41,7 @@ export const STORY_FACTORY_ADDRESS =
 
 /** StoryFactory — storyline + plot management (Base mainnet). */
 export const STORY_FACTORY_MAINNET_ADDRESS =
-  "0x92c3bd44fda84e632c3c3cb31387d0c0c1de618d" as const;
+  "0x9D2AE1E99D0A6300bfcCF41A82260374e38744Cf" as const;
 
 /** MCV2_Bond — bonding curve trading (Base Sepolia). */
 export const MCV2_BOND_ADDRESS =
diff --git a/supabase/migrations/00025_cleanup_orphan_storylines.sql b/supabase/migrations/00025_cleanup_orphan_storylines.sql
new file mode 100644
index 00000000..1b632c74
--- /dev/null
+++ b/supabase/migrations/00025_cleanup_orphan_storylines.sql
@@ -0,0 +1,57 @@
+-- [#549] Clean up orphan storylines 25-33 from first E2E attempt
+-- and reset backfill cursor for the v4b factory redeployment.
+--
+-- Storylines 25-33 were created on the v4b factory
+-- (0x9D2AE1E99D0A6300bfcCF41A82260374e38744Cf) during the first E2E
+-- attempt with wrong content hashes. They need to be removed so the
+-- backfill can re-index clean data from the same factory.
+
+-- Scope all deletes to the v4b factory to avoid touching data from
+-- any other contract.
+
+-- 1. Delete plots for orphan storylines on v4b factory
+DELETE FROM plots
+  WHERE storyline_id BETWEEN 25 AND 33
+    AND lower(contract_address) = lower('0x9D2AE1E99D0A6300bfcCF41A82260374e38744Cf');
+
+-- 2. Delete donations for orphan storylines on v4b factory
+DELETE FROM donations
+  WHERE storyline_id BETWEEN 25 AND 33
+    AND lower(contract_address) = lower('0x9D2AE1E99D0A6300bfcCF41A82260374e38744Cf');
+
+-- 3. Delete ratings for orphan storylines on v4b factory
+DELETE FROM ratings
+  WHERE storyline_id BETWEEN 25 AND 33
+    AND lower(contract_address) = lower('0x9D2AE1E99D0A6300bfcCF41A82260374e38744Cf');
+
+-- 4. Delete comments for orphan storylines on v4b factory
+DELETE FROM comments
+  WHERE storyline_id BETWEEN 25 AND 33
+    AND lower(contract_address) = lower('0x9D2AE1E99D0A6300bfcCF41A82260374e38744Cf');
+
+-- 5. Delete page views for orphan storylines on v4b factory
+DELETE FROM page_views
+  WHERE storyline_id BETWEEN 25 AND 33
+    AND lower(contract_address) = lower('0x9D2AE1E99D0A6300bfcCF41A82260374e38744Cf');
+
+-- 6. Delete trade history for orphan storylines
+DELETE FROM trade_history WHERE storyline_id BETWEEN 25 AND 33;
+
+-- 7. Delete the orphan storylines on v4b factory (last, after FK-dependent deletes)
+DELETE FROM storylines
+  WHERE storyline_id BETWEEN 25 AND 33
+    AND lower(contract_address) = lower('0x9D2AE1E99D0A6300bfcCF41A82260374e38744Cf');
+
+-- 8. Clean up backfill_failures for orphan storylines
+DELETE FROM backfill_failures WHERE storyline_id BETWEEN 25 AND 33;
+
+-- 9. Clean up notification_queue for orphan storylines (skip if table doesn't exist)
+DO $$ BEGIN
+  DELETE FROM notification_queue WHERE storyline_id BETWEEN 25 AND 33;
+EXCEPTION WHEN undefined_table THEN NULL;
+END $$;
+
+-- 10. Reset backfill cursor to just before the v4b factory deployment block
+-- so the backfill picks up events from the new factory (deployed at 43840298)
+UPDATE backfill_cursor SET last_block = 43840297 WHERE id = 1;
+UPDATE backfill_cursor SET last_block = 43840297 WHERE id = 2;