Custom Indexer Checkpoint Manager

WHAT IT DOES

Custom Indexer Checkpoint Manager is a read-only developer tool that monitors and analyzes indexing checkpoints for custom EVM event indexers. It reads the current checkpoint (last processed block and log index) from the indexer's persistent storage, compares it against the chain head, calculates how far behind the indexer is, and provides health assessments and actionable recommendations. The tool helps developers verify that their indexer is maintaining correct checkpoint state, detect lag or drift, plan checkpoint recovery procedures, and validate checkpoint integrity before performing indexer upgrades or re-syncs.

HOW TO USE

Connect your EVM-compatible wallet via the BGWallet bridge and select the network where your contract is deployed. Enter an indexer name/identifier, the contract address being indexed, and optionally provide the current checkpoint block and log index. Click "Analyze Checkpoint" to retrieve the checkpoint status. The tool fetches the current chain head and contract deployment block, validates the checkpoint against the valid block range (deployment to current head), and calculates the number of blocks behind. Results include checkpoint block and log index, blocks behind, estimated lag time (seconds, minutes, hours, days), sync progress percentage, health status (Healthy/Behind/Very Behind/Ahead of Chain), and actionable recommendations for checkpoint management including resetting, catching up, or maintaining current state.

TECHNICAL MECHANISM

The tool uses ethers.js v5.7.2 to fetch the current chain head via provider.getBlockNumber() and contract bytecode via provider.getCode(address) to validate contract existence. Deployment block is estimated using an address-derived heuristic based on the hash of the address—this is a simplified approach for demo purposes; in production, deployment block would be fetched from a block explorer API or transaction history. The checkpoint is validated against the valid range (deployment block ≤ checkpoint ≤ current block). The tool calculates blocks behind as (current_block - checkpoint_block) and estimates lag time using a 12-second block time (configurable per chain). Health classification is determined as follows: if checkpoint > current block → "Ahead" (corruption); if blocks behind > 10,000 → "Very Behind" (critical lag); if blocks behind > 1,000 → "Behind" (moderate lag); otherwise → "Healthy" (synced). Recommendations are generated based on the health status, suggesting checkpoint resets for corrupted checkpoints, catch-up syncs for lagging indexers, or maintenance of healthy checkpoints. The tool also provides a visual sync progress bar and checkpoint management actions including recommended checkpoint values.

WHAT IT CANNOT SEE

This tool has fundamental limitations that users must understand. It cannot actually modify or update the checkpoint in the indexer's database—the tool is read-only and cannot write to the indexer's persistent storage. It cannot guarantee checkpoint consistency if multiple indexers share the same checkpoint data—distributed indexer setups require manual coordination that the tool does not provide. It cannot automatically detect or recover from corrupted checkpoint data—the tool can flag invalid checkpoints but cannot repair them. It cannot validate checkpoint integrity without database access—the tool relies on the user-provided checkpoint values and cannot verify them against the actual indexer database. It cannot manage checkpoints across multiple indexer instances or sharded systems without manual coordination—the tool only analyzes one indexer at a time. It cannot handle checkpoints for indexers that do not expose a standard data API—the tool assumes the checkpoint data is accessible via user input. It cannot differentiate between intentional rewinds (e.g., for re-org handling) and corrupted checkpoints. It cannot estimate the actual time to catch up without knowing the indexer's processing speed. It cannot detect indexer-specific issues like memory limits, RPC rate limits, or database contention.

PLEASE NOTE

This tool only supports EVM-compatible blockchains (Ethereum, Polygon, BSC, Avalanche C-Chain, Optimism, Arbitrum, and their testnets). Solana, Tron, Starknet, SUI, TON, Aptos, Bitcoin, Cosmos, and XRP are not supported. The tool is free, open-source, requires no API keys, and uses the wallet's native provider for all read operations. Checkpoint management is critical for indexer health—always verify checkpoint updates in a development environment before applying to production.