Migrate a Squid to Portal

Walks the migration of an existing Squid SDK indexer onto the Portal data source. EVM and Solana have different package sets; the migration shape (data source + types + field selection) is parallel. Upstream doc (unified, both chains): https://docs.sqd.dev/en/sdk/migration/gateway-to-portal.

When to use this skill

Activate when the user says any of:

• "migrate my squid to Portal" (EVM or Solana)
• "move off v2 archive / setGateway / setDataSource / lookupArchive"
• "upgrade @subsquid/evm-processor" or "@subsquid/solana-stream to 1.x"
• references https://v2.archive.subsquid.io/...
• mentions removing SolanaRpcClient
• asks about Solana block-height-to-slot conversion
• hits compile errors on EvmBatchProcessor, evmLog, block.height, or block.header.slot after a bump
• needs to migrate processor.setPrometheusPort() / processor.setPrometheusServer() (EVM only — removed with EvmBatchProcessor)

Pre-flight