Why
This is the first PR in the broader `mptoken_issuance_history` plan. It
lands the additive schema/backend layer first so later PRs can safely
add live ETL indexing, historical backfill, and finally the RPC handler
gated on backfill completion. Keeping this step dark avoids exposing
partial history while still making the stack reviewable in small pieces.
Summary
Adds the storage and backend primitives for MPT transaction-history
filtering.
- Adds Cassandra tables:
- mpt_transactions
- account_mpt_transactions
- Adds MPTTransactionsData and backend interface methods for
writing/fetching both MPT index shapes.
Implements Cassandra write/fetch paths with forward/reverse pagination,
raw-page cursor behavior, and case-insensitive tx_type filtering before
transaction hydration.
- Adds MockBackend coverage for the new pure-virtual methods.
- Adds Cassandra integration tests for round-trip behavior, ordering,
pagination, missing transaction blobs, sparse tx_type filtering, account
fanout, and account-side filtering.
## Summary
Fixes incomplete MPT holder indexing in ETL.
Previously, Clio only indexed MPT holders when an `ltMPTOKEN` ledger
node was created by an `MPTokenAuthorize` transaction. However, with
future amendments, XRPL can also create `ltMPTOKEN` nodes as part of
other successful transactions, such as `Payment`, when a holder receives
an MPT. Those holders were silently skipped and therefore missing from
the `mpt_holders` RPC results.
This change makes MPT holder indexing metadata-driven instead of
transaction-type-driven. ETL now scans successful transaction metadata
for newly created `ltMPTOKEN` nodes and writes every holder it finds.
## What Changed
- MPT holder extraction now works for any successful transaction that
creates an `ltMPTOKEN`.
- Multiple MPT holders created in a single transaction are all indexed.
- The `mpt_holders` table is kept consistent with ledger metadata
instead of relying on assumptions about which transaction types can
create holder nodes.
- Added regression coverage for MPT holders created by a `Payment`
transaction.
## Testing
- `build/clio_tests '--gtest_filter=MPTExtTests.*'`
- `clang-tidy -p build src/etl/MPTHelpers.cpp src/etl/MPTHelpers.hpp
src/etl/impl/ext/MPT.cpp tests/unit/etl/ext/MPTTests.cpp`
Fix 2 issues in integration tests:
- `127.0.0.2` is forwarded to localhost on macos
- Keyspace is always dropped in test's destructor but it may not exist
