diff --git a/migration/1768900000000-SyncTransactionAmlData.js b/migration/1768900000000-SyncTransactionAmlData.js
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+++ b/migration/1768900000000-SyncTransactionAmlData.js
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+/**
+ * @typedef {import('typeorm').MigrationInterface} MigrationInterface
+ * @typedef {import('typeorm').QueryRunner} QueryRunner
+ */
+
+/**
+ * Sync transaction AML data for buy_crypto and buy_fiat records with mismatched amlCheck status.
+ *
+ * This migration fixes two types of data synchronization issues:
+ *
+ * 1. BUG FIX (Parts 1-2): Transactions completed before AML check passed.
+ *    When the AML check was later set to Pass, postProcessing was not called
+ *    because isComplete was already true.
+ *    - BuyCrypto: 13 records, ~162k CHF (amlCheck='Pass' but t.amlCheck is NULL or 'Fail')
+ *    - BuyFiat: 1 record, ~371 CHF (amlCheck='Pass' but t.amlCheck is NULL)
+ *
+ * 2. HISTORICAL CLEANUP (Parts 3-5): Chargebacks, blocks, and manual stops that changed
+ *    amlCheck after the transaction was already marked as Pass in the transaction table.
+ *    - BuyCrypto Fail: 25 records, ~150k CHF (amlCheck='Fail' but t.amlCheck='Pass')
+ *    - BuyFiat Fail: 7 records, ~201k CHF (amlCheck='Fail' but t.amlCheck='Pass')
+ *    - BuyFiat ManualStop: 115 records, ~2k CHF (amlCheck='ManualStop' but t.amlCheck='Pass')
+ *
+ * Related issue: https://github.com/DFXswiss/api/issues/3086
+ *
+ * @class
+ * @implements {MigrationInterface}
+ */
+module.exports = class SyncTransactionAmlData1768900000000 {
+  name = 'SyncTransactionAmlData1768900000000';
+
+  /**
+   * @param {QueryRunner} queryRunner
+   */
+  async up(queryRunner) {
+    // =====================================================================
+    // PART 1: Fix BuyCrypto transactions (outputAsset -> asset table)
+    // Fixes cases where bc.amlCheck='Pass' but t.amlCheck is NULL or different
+    // =====================================================================
+    console.log('=== PART 1: BuyCrypto ===\n');
+
+    // Check for incomplete source data
+    const incompleteBuyCrypto = await queryRunner.query(`
+      SELECT
+        t.id AS transactionId,
+        bc.id AS buyCryptoId,
+        bc.inputReferenceAsset,
+        bc.outputAssetId
+      FROM dbo.[transaction] t
+      INNER JOIN dbo.buy_crypto bc ON bc.transactionId = t.id
+      WHERE bc.amlCheck = 'Pass'
+        AND (t.amlCheck IS NULL OR t.amlCheck <> 'Pass')
+        AND (bc.inputReferenceAsset IS NULL OR bc.outputAssetId IS NULL)
+    `);
+
+    if (incompleteBuyCrypto.length > 0) {
+      console.log(`WARNING: Found ${incompleteBuyCrypto.length} BuyCrypto with incomplete source data (SKIPPED):`);
+      for (const tx of incompleteBuyCrypto) {
+        console.log(`  - Transaction ${tx.transactionId}, BuyCrypto ${tx.buyCryptoId}`);
+      }
+    }
+
+    // Find BuyCrypto transactions to fix (where bc.amlCheck='Pass' but t.amlCheck is not 'Pass')
+    const buyCryptoToFix = await queryRunner.query(`
+      SELECT
+        t.id AS transactionId,
+        bc.id AS buyCryptoId,
+        t.amlCheck AS currentTxAmlCheck,
+        bc.inputReferenceAsset,
+        a.name AS outputAssetName,
+        bc.amountInChf
+      FROM dbo.[transaction] t
+      INNER JOIN dbo.buy_crypto bc ON bc.transactionId = t.id
+      INNER JOIN dbo.asset a ON bc.outputAssetId = a.id
+      WHERE bc.amlCheck = 'Pass'
+        AND (t.amlCheck IS NULL OR t.amlCheck <> 'Pass')
+        AND bc.inputReferenceAsset IS NOT NULL
+    `);
+
+    console.log(`Found ${buyCryptoToFix.length} BuyCrypto transactions to fix:`);
+    for (const tx of buyCryptoToFix) {
+      console.log(
+        `  - Transaction ${tx.transactionId}, BuyCrypto ${tx.buyCryptoId}: ` +
+          `${tx.amountInChf} CHF, assets=${tx.inputReferenceAsset}-${tx.outputAssetName}, ` +
+          `current t.amlCheck=${tx.currentTxAmlCheck}`,
+      );
+    }
+
+    if (buyCryptoToFix.length > 0) {
+      const result = await queryRunner.query(`
+        UPDATE t
+        SET
+          t.amlCheck = 'Pass',
+          t.assets = bc.inputReferenceAsset + '-' + a.name,
+          t.amountInChf = bc.amountInChf,
+          t.highRisk = COALESCE(bc.highRisk, 0),
+          t.eventDate = bc.created,
+          t.amlType = t.type,
+          t.updated = GETDATE()
+        FROM dbo.[transaction] t
+        INNER JOIN dbo.buy_crypto bc ON bc.transactionId = t.id
+        INNER JOIN dbo.asset a ON bc.outputAssetId = a.id
+        WHERE bc.amlCheck = 'Pass'
+          AND (t.amlCheck IS NULL OR t.amlCheck <> 'Pass')
+          AND bc.inputReferenceAsset IS NOT NULL
+      `);
+      console.log(`Updated ${result?.rowsAffected ?? buyCryptoToFix.length} BuyCrypto transaction records\n`);
+    }
+
+    // =====================================================================
+    // PART 2: Fix BuyFiat transactions (outputAsset -> fiat table)
+    // Fixes cases where bf.amlCheck='Pass' but t.amlCheck is NULL or different
+    // =====================================================================
+    console.log('=== PART 2: BuyFiat ===\n');
+
+    // Check for incomplete source data
+    const incompleteBuyFiat = await queryRunner.query(`
+      SELECT
+        t.id AS transactionId,
+        bf.id AS buyFiatId,
+        bf.inputReferenceAsset,
+        bf.outputAssetId
+      FROM dbo.[transaction] t
+      INNER JOIN dbo.buy_fiat bf ON bf.transactionId = t.id
+      WHERE bf.amlCheck = 'Pass'
+        AND (t.amlCheck IS NULL OR t.amlCheck <> 'Pass')
+        AND (bf.inputReferenceAsset IS NULL OR bf.outputAssetId IS NULL)
+    `);
+
+    if (incompleteBuyFiat.length > 0) {
+      console.log(`WARNING: Found ${incompleteBuyFiat.length} BuyFiat with incomplete source data (SKIPPED):`);
+      for (const tx of incompleteBuyFiat) {
+        console.log(`  - Transaction ${tx.transactionId}, BuyFiat ${tx.buyFiatId}`);
+      }
+    }
+
+    // Find BuyFiat transactions to fix (where bf.amlCheck='Pass' but t.amlCheck is not 'Pass')
+    const buyFiatToFix = await queryRunner.query(`
+      SELECT
+        t.id AS transactionId,
+        bf.id AS buyFiatId,
+        t.amlCheck AS currentTxAmlCheck,
+        bf.inputReferenceAsset,
+        f.name AS outputAssetName,
+        bf.amountInChf
+      FROM dbo.[transaction] t
+      INNER JOIN dbo.buy_fiat bf ON bf.transactionId = t.id
+      INNER JOIN dbo.fiat f ON bf.outputAssetId = f.id
+      WHERE bf.amlCheck = 'Pass'
+        AND (t.amlCheck IS NULL OR t.amlCheck <> 'Pass')
+        AND bf.inputReferenceAsset IS NOT NULL
+    `);
+
+    console.log(`Found ${buyFiatToFix.length} BuyFiat transactions to fix:`);
+    for (const tx of buyFiatToFix) {
+      console.log(
+        `  - Transaction ${tx.transactionId}, BuyFiat ${tx.buyFiatId}: ` +
+          `${tx.amountInChf} CHF, assets=${tx.inputReferenceAsset}-${tx.outputAssetName}, ` +
+          `current t.amlCheck=${tx.currentTxAmlCheck}`,
+      );
+    }
+
+    if (buyFiatToFix.length > 0) {
+      const result = await queryRunner.query(`
+        UPDATE t
+        SET
+          t.amlCheck = 'Pass',
+          t.assets = bf.inputReferenceAsset + '-' + f.name,
+          t.amountInChf = bf.amountInChf,
+          t.highRisk = COALESCE(bf.highRisk, 0),
+          t.eventDate = bf.created,
+          t.amlType = t.type,
+          t.updated = GETDATE()
+        FROM dbo.[transaction] t
+        INNER JOIN dbo.buy_fiat bf ON bf.transactionId = t.id
+        INNER JOIN dbo.fiat f ON bf.outputAssetId = f.id
+        WHERE bf.amlCheck = 'Pass'
+          AND (t.amlCheck IS NULL OR t.amlCheck <> 'Pass')
+          AND bf.inputReferenceAsset IS NOT NULL
+      `);
+      console.log(`Updated ${result?.rowsAffected ?? buyFiatToFix.length} BuyFiat transaction records\n`);
+    }
+
+    // =====================================================================
+    // PART 3: Reset BuyCrypto transactions where bc.amlCheck='Fail' but t.amlCheck='Pass'
+    // These are chargebacks/blocks that happened after transaction was marked Pass
+    // =====================================================================
+    console.log('=== PART 3: BuyCrypto Fail/Pass Cleanup ===\n');
+
+    const buyCryptoFailPass = await queryRunner.query(`
+      SELECT
+        t.id AS transactionId,
+        bc.id AS buyCryptoId,
+        bc.amlReason,
+        bc.chargebackDate,
+        bc.amountInChf
+      FROM dbo.[transaction] t
+      INNER JOIN dbo.buy_crypto bc ON bc.transactionId = t.id
+      WHERE bc.amlCheck = 'Fail' AND t.amlCheck = 'Pass'
+    `);
+
+    console.log(`Found ${buyCryptoFailPass.length} BuyCrypto with Fail/Pass mismatch to reset:`);
+    for (const tx of buyCryptoFailPass) {
+      console.log(
+        `  - Transaction ${tx.transactionId}, BuyCrypto ${tx.buyCryptoId}: ` +
+          `${tx.amountInChf} CHF, reason=${tx.amlReason}, chargeback=${tx.chargebackDate ?? 'none'}`,
+      );
+    }
+
+    if (buyCryptoFailPass.length > 0) {
+      const result = await queryRunner.query(`
+        UPDATE t
+        SET
+          t.amlCheck = NULL,
+          t.assets = NULL,
+          t.amountInChf = NULL,
+          t.highRisk = NULL,
+          t.eventDate = NULL,
+          t.amlType = NULL,
+          t.updated = GETDATE()
+        FROM dbo.[transaction] t
+        INNER JOIN dbo.buy_crypto bc ON bc.transactionId = t.id
+        WHERE bc.amlCheck = 'Fail' AND t.amlCheck = 'Pass'
+      `);
+      console.log(`Reset ${result?.rowsAffected ?? buyCryptoFailPass.length} BuyCrypto transaction records\n`);
+    }
+
+    // =====================================================================
+    // PART 4: Reset BuyFiat transactions where bf.amlCheck='Fail' but t.amlCheck='Pass'
+    // These are chargebacks/blocks that happened after transaction was marked Pass
+    // =====================================================================
+    console.log('=== PART 4: BuyFiat Fail/Pass Cleanup ===\n');
+
+    const buyFiatFailPass = await queryRunner.query(`
+      SELECT
+        t.id AS transactionId,
+        bf.id AS buyFiatId,
+        bf.amlReason,
+        bf.amountInChf
+      FROM dbo.[transaction] t
+      INNER JOIN dbo.buy_fiat bf ON bf.transactionId = t.id
+      WHERE bf.amlCheck = 'Fail' AND t.amlCheck = 'Pass'
+    `);
+
+    console.log(`Found ${buyFiatFailPass.length} BuyFiat with Fail/Pass mismatch to reset:`);
+    for (const tx of buyFiatFailPass) {
+      console.log(
+        `  - Transaction ${tx.transactionId}, BuyFiat ${tx.buyFiatId}: ` +
+          `${tx.amountInChf} CHF, reason=${tx.amlReason}`,
+      );
+    }
+
+    if (buyFiatFailPass.length > 0) {
+      const result = await queryRunner.query(`
+        UPDATE t
+        SET
+          t.amlCheck = NULL,
+          t.assets = NULL,
+          t.amountInChf = NULL,
+          t.highRisk = NULL,
+          t.eventDate = NULL,
+          t.amlType = NULL,
+          t.updated = GETDATE()
+        FROM dbo.[transaction] t
+        INNER JOIN dbo.buy_fiat bf ON bf.transactionId = t.id
+        WHERE bf.amlCheck = 'Fail' AND t.amlCheck = 'Pass'
+      `);
+      console.log(`Reset ${result?.rowsAffected ?? buyFiatFailPass.length} BuyFiat transaction records\n`);
+    }
+
+    // =====================================================================
+    // PART 5: Reset BuyFiat transactions where bf.amlCheck='ManualStop' but t.amlCheck='Pass'
+    // These are manually stopped transactions that should not count as Pass
+    // =====================================================================
+    console.log('=== PART 5: BuyFiat ManualStop/Pass Cleanup ===\n');
+
+    const buyFiatManualStopPass = await queryRunner.query(`
+      SELECT
+        t.id AS transactionId,
+        bf.id AS buyFiatId,
+        bf.amlReason,
+        bf.amountInChf
+      FROM dbo.[transaction] t
+      INNER JOIN dbo.buy_fiat bf ON bf.transactionId = t.id
+      WHERE bf.amlCheck = 'ManualStop' AND t.amlCheck = 'Pass'
+    `);
+
+    console.log(`Found ${buyFiatManualStopPass.length} BuyFiat with ManualStop/Pass mismatch to reset:`);
+    for (const tx of buyFiatManualStopPass) {
+      console.log(
+        `  - Transaction ${tx.transactionId}, BuyFiat ${tx.buyFiatId}: ` +
+          `${tx.amountInChf} CHF, reason=${tx.amlReason}`,
+      );
+    }
+
+    if (buyFiatManualStopPass.length > 0) {
+      const result = await queryRunner.query(`
+        UPDATE t
+        SET
+          t.amlCheck = NULL,
+          t.assets = NULL,
+          t.amountInChf = NULL,
+          t.highRisk = NULL,
+          t.eventDate = NULL,
+          t.amlType = NULL,
+          t.updated = GETDATE()
+        FROM dbo.[transaction] t
+        INNER JOIN dbo.buy_fiat bf ON bf.transactionId = t.id
+        WHERE bf.amlCheck = 'ManualStop' AND t.amlCheck = 'Pass'
+      `);
+      console.log(`Reset ${result?.rowsAffected ?? buyFiatManualStopPass.length} BuyFiat ManualStop transaction records\n`);
+    }
+
+    // =====================================================================
+    // Summary
+    // =====================================================================
+    const totalFixed = buyCryptoToFix.length + buyFiatToFix.length;
+    const totalReset = buyCryptoFailPass.length + buyFiatFailPass.length + buyFiatManualStopPass.length;
+    console.log(`=== SUMMARY ===`);
+    console.log(`  Pass sync: ${totalFixed} transactions (Parts 1-2)`);
+    console.log(`  Fail/ManualStop reset: ${totalReset} transactions (Parts 3-5)`);
+    console.log(`  Total: ${totalFixed + totalReset} transactions`);
+  }
+
+  /**
+   * @param {QueryRunner} queryRunner
+   */
+  async down(queryRunner) {
+    // This migration fixes data that was incorrectly left unsynchronized due to a bug.
+    // Rolling back would return the data to an incorrect state.
+    // If a rollback is truly needed, the affected transaction IDs should be identified
+    // from the migration logs and handled manually.
+    console.log(
+      'Down migration is a no-op. Rolling back would return data to an incorrect state. ' +
+        'If needed, identify affected transactions from migration logs and handle manually.',
+    );
+  }
+};