Set MaxLogsKept to 1

Also:

- Lower LogPrunePageSize from default 10,000 to 999

With present settings, it's running once every 40 mins and deleting
around 3200 logs. This only takes a few seconds, but appears to be
slowing down other queries a bit when it happens. Cutting this down
to 999 will hopefully keep it more stable.

core/services/relay/evm/evm.go

@@ -440,7 +440,7 @@ func (r *Relayer) NewCCIPCommitProvider(rargs commontypes.RelayArgs, pargs commo
 	subjectID := chainToUUID(configWatcher.chain.ID())
 	contractTransmitter, err := newOnChainContractTransmitter(ctx, r.lggr, rargs, r.ks.Eth(), configWatcher, configTransmitterOpts{
 		subjectID: &subjectID,
-	}, OCR2AggregatorTransmissionContractABI, WithReportToEthMetadata(fn), WithRetention(0))
+	}, OCR2AggregatorTransmissionContractABI, WithReportToEthMetadata(fn), WithMaxLogsKept(1))
 	if err != nil {
 		return nil, err
 	}
@@ -517,7 +517,7 @@ func (r *Relayer) NewCCIPExecProvider(rargs commontypes.RelayArgs, pargs commont
 	subjectID := chainToUUID(configWatcher.chain.ID())
 	contractTransmitter, err := newOnChainContractTransmitter(ctx, r.lggr, rargs, r.ks.Eth(), configWatcher, configTransmitterOpts{
 		subjectID: &subjectID,
-	}, OCR2AggregatorTransmissionContractABI, WithReportToEthMetadata(fn), WithRetention(0), WithExcludeSignatures())
+	}, OCR2AggregatorTransmissionContractABI, WithReportToEthMetadata(fn), WithMaxLogsKept(1), WithExcludeSignatures())
 	if err != nil {
 		return nil, err
 	}

integration-tests/ccip-tests/testconfig/tomls/ccip1.4-stress/baseline.toml

@@ -132,8 +132,8 @@ DeltaReconcile = '5s'
 
 CommonChainConfigTOML = """
 LogPollInterval = '1s'
-LogPrunePageSize = 5001
-LogKeepBlocksDepth = 1000
+LogPrunePageSize = 999
+LogKeepBlocksDepth = 4000
 
 [HeadTracker]
 HistoryDepth = 200