feat: distributed tracing, audit log partitioning, mock Horizon, fee calculator (#709 #711 #712 #720)#795
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…cal-mock-horizon-api-server, extract-congestion-fee-calculator-module - Stellar-Fluid#709: Add W3C traceparent distributed tracing in fluid-server (tracing.rs) - SpanContext with trace/span ID generation and propagation - Extract/inject helpers for HTTP headers - traceparent header on fee-bump responses - Stellar-Fluid#711: Partition AuditLog table by month in server - SQL migration (20260601000000_partition_audit_logs_by_month) - AuditLogPartitionManager service with ensurePartitions/listPartitions/pruneOldPartitions - Full unit test coverage - Stellar-Fluid#712: Extract congestion fee calculator module in fluid-server (fee_calculator.rs) - Pure calculate_fee() function decoupled from API server - FeeCalculator struct with configurable base_fee and multiplier - CongestionLevel classification (low/medium/high) - Stellar-Fluid#720: Local mock Horizon API server in fluid-server (mock_horizon.rs) - Simulates success, 429, 500, 502, 503, 504, connection reset - Horizon tx error extras (tx_bad_seq, tx_insufficient_fee, tx_failed) - Latency injection, per-path scenario overrides, request capture - fail_count auto-reset for transient failure simulation Also fix pre-existing compile errors: xdr.rs borrow, archive.rs ByteStream, memory_leak_profiling.rs import, load_testing_integration.rs String type, main.rs duplicate serde import.
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Summary
Closes #709
Closes #711
Closes #712
Closes #720
#709 — Distributed Tracing Integration (
fluid-server)src/tracing.rs: W3CtraceparentSpanContext (TraceId, SpanId), extract/inject helpers for HTTP boundariesfee_bumphandler extracts incoming trace context and echoestraceparenton the response#711 — Partition Audit Logs Table (
server)20260601000000_partition_audit_logs_by_month: RANGE-partitionedAuditLogwith monthly child partitions (24 months back → 3 ahead) + default partitionauditLogPartitionManager.ts:ensurePartitions,listPartitions,pruneOldPartitionsauditLogPartitionManager.test.ts#712 — Extract Congestion Fee Calculator Module (
fluid-server)src/fee_calculator.rs: purecalculate_fee()+FeeCalculatorstruct decoupled from the API serverCongestionLevelenum (Low/Medium/High), full unit tests#720 — Local Mock Horizon API Server (
fluid-server)src/mock_horizon.rs: in-process Axum server simulating HorizonPre-existing compile fixes
xdr.rsborrow checker,archive.rsByteStream,memory_leak_profiling.rsimport,load_testing_integration.rsString type,main.rsduplicate serde import