Fix buy/sell transactions silently failing on-chain (#157)

* fix(core): disable account_data_size limit and add meta.err checking

The 12.5MB setLoadedAccountsDataSizeLimit was causing all buy transactions
to fail with MaxLoadedAccountsDataSizeExceeded since pump.fun migrated to
Token-2022. Transactions landed on-chain (fees paid) but inner instructions
were rejected — the bot paid gas for nothing.

Changes:
- Disable account_data_size in all bot configs (Token-2022 needs >12.5MB)
- Add meta.err check in get_buy_transaction_details() for clear error
  reporting when transactions fail on-chain
- Include tx signature in platform_aware.py error messages for debugging

Tested: full buy→sell→cleanup cycle works on pump_fun with geyser listener.


* fix(core): check meta.err in confirm_transaction to detect failed txs

Solana transactions can be "confirmed" (included in a block) but still
fail execution if inner program instructions are rejected. Previously,
confirm_transaction only checked that the tx landed on-chain, causing
silent failures in buy, sell, and cleanup operations.

Now fetches the transaction result after confirmation and checks
meta.err, returning False when the transaction failed. This fixes
the ATA cleanup issue where sells were silently failing with
Custom: 6003 errors, leaving non-zero token balances.


* fix(core): treat failed tx fetch as unconfirmed in confirm_transaction

When _get_transaction_result returns None (RPC failure, timeout, etc.),
the function was falling through to return True — silently treating an
unknown state as success. Now returns False with a warning log.

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

bots/bot-sniper-1-geyser.yaml

@@ -63,7 +63,7 @@ compute_units:
   # Note: Savings don't show in "consumed CU" but improve tx priority/cost.
   # Note (Nov 23, 2025): with data size set to 512KB, transactions fail - increasing to 12.5MB resolves the issue.
   # Reference: https://www.anza.xyz/blog/cu-optimization-with-setloadedaccountsdatasizelimit
-  account_data_size: 12_500_000
+  # account_data_size: 12_500_000  # Disabled: causes MaxLoadedAccountsDataSizeExceeded with Token-2022
 
 # Filters for token selection
 filters:

bots/bot-sniper-2-logs.yaml

@@ -63,7 +63,7 @@ compute_units:
   # Note: Savings don't show in "consumed CU" but improve tx priority/cost.
   # Note (Nov 23, 2025): with data size set to 512KB, transactions fail - increasing to 12.5MB resolves the issue.
   # Reference: https://www.anza.xyz/blog/cu-optimization-with-setloadedaccountsdatasizelimit
-  account_data_size: 12_500_000
+  # account_data_size: 12_500_000  # Disabled: causes MaxLoadedAccountsDataSizeExceeded with Token-2022
 
 # Filters for token selection
 filters:

bots/bot-sniper-3-blocks.yaml

@@ -63,7 +63,7 @@ compute_units:
   # Note: Savings don't show in "consumed CU" but improve tx priority/cost.
   # Note (Nov 23, 2025): with data size set to 512KB, transactions fail - increasing to 12.5MB resolves the issue.
   # Reference: https://www.anza.xyz/blog/cu-optimization-with-setloadedaccountsdatasizelimit
-  account_data_size: 12_500_000
+  # account_data_size: 12_500_000  # Disabled: causes MaxLoadedAccountsDataSizeExceeded with Token-2022
 
 # Filters for token selection
 filters:

bots/bot-sniper-4-pp.yaml

@@ -61,7 +61,7 @@ compute_units:
   # Note: Savings don't show in "consumed CU" but improve tx priority/cost.
   # Note (Nov 23, 2025): with data size set to 512KB, transactions fail - increasing to 12.5MB resolves the issue.
   # Reference: https://www.anza.xyz/blog/cu-optimization-with-setloadedaccountsdatasizelimit
-  account_data_size: 12_500_000
+  # account_data_size: 12_500_000  # Disabled: causes MaxLoadedAccountsDataSizeExceeded with Token-2022
 
 # Filters for token selection
 filters:

src/core/client.py

@@ -280,14 +280,18 @@ class SolanaClient:
     async def confirm_transaction(
         self, signature: str, commitment: str = "confirmed"
     ) -> bool:
-        """Wait for transaction confirmation.
+        """Wait for transaction confirmation and verify execution success.
+
+        Confirms the transaction landed on-chain, then checks meta.err to
+        ensure the inner program instructions actually succeeded. A transaction
+        can be "confirmed" (included in a block) but still fail execution.
 
         Args:
             signature: Transaction signature
             commitment: Confirmation commitment level
 
         Returns:
-            Whether transaction was confirmed
+            Whether transaction was confirmed AND executed successfully
         """
         await self._rate_limiter.acquire()
         client = await self.get_client()
@@ -295,11 +299,28 @@ class SolanaClient:
             await client.confirm_transaction(
                 signature, commitment=commitment, sleep_seconds=1
             )
-            return True
         except Exception:
             logger.exception(f"Failed to confirm transaction {signature}")
             return False
 
+        # Verify the transaction actually succeeded (no program errors)
+        result = await self._get_transaction_result(str(signature))
+        if not result:
+            logger.warning(
+                f"Could not fetch transaction {str(signature)[:16]}... "
+                f"to verify execution — treating as unconfirmed"
+            )
+            return False
+
+        tx_err = result.get("meta", {}).get("err")
+        if tx_err:
+            logger.error(
+                f"Transaction {str(signature)[:16]}... confirmed but failed: {tx_err}"
+            )
+            return False
+
+        return True
+
     async def get_transaction_token_balance(
         self, signature: str, user_pubkey: Pubkey, mint: Pubkey
     ) -> int | None:
@@ -354,6 +375,15 @@ class SolanaClient:
             return None, None
 
         meta = result.get("meta", {})
+
+        # Check for transaction execution errors (e.g., MaxLoadedAccountsDataSizeExceeded)
+        tx_err = meta.get("err")
+        if tx_err:
+            logger.error(
+                f"Transaction {signature[:16]}... failed with error: {tx_err}"
+            )
+            return None, None
+
         mint_str = str(mint)
 
         # Get tokens received from pre/post token balance diff

src/trading/platform_aware.py

@@ -156,7 +156,8 @@ class PlatformAwareBuyer(Trader):
                 else:
                     raise ValueError(
                         f"Failed to parse transaction details: tokens={tokens_raw}, "
-                        f"sol_spent={sol_spent}"
+                        f"sol_spent={sol_spent} (tx: {tx_signature}). "
+                        f"The transaction may have failed on-chain — check explorer."
                     )
 
                 return TradeResult(