operations, operations_accounts: Remove txHash from operations table and build tx TOID using operation ID

[aditya1702]

What

This PR removes the tx_hash column and foreign key constraint from the operations table, replacing the direct transaction hash reference with a TOID (Transaction/Operation ID) encoding scheme. Operations are now associated with transactions by deriving the transaction's ToID from the operation ID using bit masking (id &^ 0xFFF in Go, id & ~x'FFF'::bigint in SQL).

• Removed tx_hash column and foreign key from operations table schema
• Updated all queries to use TOID range-based lookups (id > to_id AND id < to_id + 4096) instead of tx_hash equality
• Removed TxHash field from types.Operation struct and updated all processors, tests, and GraphQL resolvers
• Changed dataloader from OperationsByTxHashLoader to OperationsByToIDLoader using TOID bit masking

Known limitations

[TODO or N/A]

Issue that this PR addresses

Closes #482

[Copilot]

Pull request overview

This PR removes the tx_hash column and foreign key constraint from the operations table, replacing the direct transaction hash reference with a TOID (Transaction/Operation ID) encoding scheme. Operations are now associated with transactions by deriving the transaction's ToID from the operation ID using bit masking (id &^ 0xFFF in Go, id & ~x'FFF'::bigint in SQL).

Changes:

• Removed tx_hash column and foreign key from operations table schema
• Updated all queries to use TOID range-based lookups (id > to_id AND id < to_id + 4096) instead of tx_hash equality
• Removed TxHash field from types.Operation struct and updated all processors, tests, and GraphQL resolvers
• Changed dataloader from OperationsByTxHashLoader to OperationsByToIDLoader using TOID bit masking

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
internal/db/migrations/2025-06-10.3-create_indexer_table_operations.sql	Removes tx_hash column, foreign key constraint, and associated indexes from operations table
internal/indexer/types/types.go	Removes TxHash field from Operation struct
internal/indexer/processors/utils.go	Removes TxHash assignment in ConvertOperation function
internal/indexer/processors/utils_test.go	Updates test assertions to remove TxHash field
internal/data/operations.go	Replaces BatchGetByTxHash(es) methods with BatchGetByToID(s) using TOID range queries
internal/data/operations_test.go	Updates all tests to use ToID-based lookups with proper TOID ranges (multiples of 4096)
internal/data/transactions.go	Updates BatchGetByOperationIDs to join using TOID bit masking instead of tx_hash
internal/data/transactions_test.go	Updates tests with proper TOID values for transaction-operation relationships
internal/data/accounts_test.go	Updates test data setup to use proper TOID ranges
internal/serve/graphql/dataloaders/operation_loaders.go	Replaces hash-based dataloader with ToID-based dataloader using bit masking
internal/serve/graphql/dataloaders/loaders.go	Renames loader from OperationsByTxHashLoader to OperationsByToIDLoader
internal/serve/graphql/resolvers/transaction.resolvers.go	Updates resolver to use ToID instead of Hash for loading operations
internal/serve/graphql/resolvers/test_utils.go	Updates test setup to derive tx_hash from operation IDs using toid.Parse
internal/serve/graphql/resolvers/*.go (tests)	Updates all GraphQL resolver tests to work with ToID-based operations
internal/services/ingest_test.go	Updates test helpers and cleanup logic for operations without tx_hash
internal/indexer/indexer_buffer_test.go	Removes TxHash from test operation creation

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