removes 'clear*' methods from the walletDb (#5639)

the walletDb has serveral leftover implementations of methods that clear
datastores

these methods are unused

not only are these methods unused, but they _should not_ be used: calling
'clear' on a datastore has the potential to block the wallet and node process
while deleting from the database. data are deleted from these stores
incrementally in the background using 'cleanUpDeletedAccounts' for this reason

ironfish/src/wallet/walletdb/walletdb.ts

@@ -418,7 +418,7 @@ export class WalletDB {
   async removeAccount(account: Account, tx?: IDatabaseTransaction): Promise<void> {
     await this.db.withTransaction(tx, async (tx) => {
       await this.accounts.del(account.id, tx)
-      await this.clearBalance(account, tx)
+      await this.balances.clear(tx, account.prefixRange)
       await this.accountIdsToCleanup.put(account.id, null, tx)
     })
   }
@@ -542,19 +542,6 @@ export class WalletDB {
     await this.transactions.del([account.prefix, transactionHash], tx)
   }
 
-  async clearTransactions(account: Account, tx?: IDatabaseTransaction): Promise<void> {
-    await this.transactions.clear(tx, account.prefixRange)
-    await this.timestampToTransactionHash.clear(tx, account.prefixRange)
-  }
-
-  async clearSequenceToNoteHash(account: Account, tx?: IDatabaseTransaction): Promise<void> {
-    await this.sequenceToNoteHash.clear(tx, account.prefixRange)
-  }
-
-  async clearNonChainNoteHashes(account: Account, tx?: IDatabaseTransaction): Promise<void> {
-    await this.nonChainNoteHashes.clear(tx, account.prefixRange)
-  }
-
   async *getTransactionHashesBySequence(
     account: Account,
     tx?: IDatabaseTransaction,
@@ -658,20 +645,6 @@ export class WalletDB {
     })
   }
 
-  /*
-   * clears sequenceToNoteHash entries for all accounts for a given sequence
-   */
-  async clearSequenceNoteHashes(sequence: number, tx?: IDatabaseTransaction): Promise<void> {
-    const encoding = this.sequenceToNoteHash.keyEncoding
-
-    const keyRange = StorageUtils.getPrefixesKeyRange(
-      encoding.serialize([Buffer.alloc(4, 0), [sequence, Buffer.alloc(0)]]),
-      encoding.serialize([Buffer.alloc(4, 255), [sequence, Buffer.alloc(0)]]),
-    )
-
-    await this.sequenceToNoteHash.clear(tx, keyRange)
-  }
-
   async addUnspentNoteHash(
     account: Account,
     noteHash: Buffer,
@@ -1027,10 +1000,6 @@ export class WalletDB {
     await this.decryptedNotes.del([account.prefix, noteHash], tx)
   }
 
-  async clearDecryptedNotes(account: Account, tx?: IDatabaseTransaction): Promise<void> {
-    await this.decryptedNotes.clear(tx, account.prefixRange)
-  }
-
   async *loadDecryptedNotes(
     account: Account,
     range?: DatabaseKeyRange,
@@ -1088,10 +1057,6 @@ export class WalletDB {
     await this.balances.put([account.prefix, assetId], balance, tx)
   }
 
-  async clearBalance(account: Account, tx?: IDatabaseTransaction): Promise<void> {
-    await this.balances.clear(tx, account.prefixRange)
-  }
-
   async *loadExpiredTransactionHashes(
     account: Account,
     headSequence: number,
@@ -1221,13 +1186,6 @@ export class WalletDB {
     await this.pendingTransactionHashes.del([account.prefix, [expiration, transactionHash]], tx)
   }
 
-  async clearPendingTransactionHashes(
-    account: Account,
-    tx?: IDatabaseTransaction,
-  ): Promise<void> {
-    await this.pendingTransactionHashes.clear(tx, account.prefixRange)
-  }
-
   async forceCleanupDeletedAccounts(signal?: AbortSignal): Promise<void> {
     return this.cleanupDeletedAccounts(Number.POSITIVE_INFINITY, signal)
   }