don't rely on blocks table for cpfp indexing progress

backend/src/repositories/BlocksRepository.ts

@@ -8,6 +8,8 @@ import HashratesRepository from './HashratesRepository';
 import { escape } from 'mysql2';
 import BlocksSummariesRepository from './BlocksSummariesRepository';
 import DifficultyAdjustmentsRepository from './DifficultyAdjustmentsRepository';
+import bitcoinClient from '../api/bitcoin/bitcoin-client';
+import config from '../config';
 
 class BlocksRepository {
   /**
@@ -667,16 +669,26 @@ class BlocksRepository {
    */
    public async $getCPFPUnindexedBlocks(): Promise<any[]> {
     try {
-      const [rows]: any = await DB.query(`SELECT height, hash FROM blocks WHERE cpfp_indexed = 0 ORDER BY height DESC`);
-      return rows;
+      const blockchainInfo = await bitcoinClient.getBlockchainInfo();
+      const currentBlockHeight = blockchainInfo.blocks;
+      const [lastHeightRows]: any = await DB.query(`SELECT MIN(height) AS minHeight from cpfp_clusters`);
+      const lastHeight = (lastHeightRows.length && lastHeightRows[0].minHeight != null) ? lastHeightRows[0].minHeight : currentBlockHeight;
+
+      let indexingBlockAmount = Math.min(config.MEMPOOL.INDEXING_BLOCKS_AMOUNT, blockchainInfo.blocks);
+      if (indexingBlockAmount <= -1) {
+        indexingBlockAmount = currentBlockHeight + 1;
+      }
+      const firstHeight = Math.max(0, currentBlockHeight - indexingBlockAmount + 1);
+
+      if (firstHeight < lastHeight) {
+        const [rows]: any = await DB.query(`SELECT height, hash FROM blocks WHERE height BETWEEN ? AND ? ORDER BY height DESC`, [firstHeight, lastHeight]);
+        return rows;
+      }
     } catch (e) {
       logger.err('Cannot fetch CPFP unindexed blocks. Reason: ' + (e instanceof Error ? e.message : e));
       throw e;
     }
-  }
-
-  public async $setCPFPIndexed(hash: string): Promise<void> {
-    await DB.query(`UPDATE blocks SET cpfp_indexed = 1 WHERE hash = ?`, [hash]);
+    return [];
   }
 
   /**