docs(4-data-queries): document transform additive mode and in-place JSON parsing#222
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…SON parsing Clarify that adapter transforms run in replacement mode by default and flip to additive mode when any key is prefixed with + or -. Add a worked example showing how to decode a stringified JSON field in place using +field: "field|@ParseJson". Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
+/-keys = original event is discarded) vs additive mode (any+/-key flips the whole transform to additive, even when mixed with non-prefixed keys).+event_data: "event_data|@parsejson"to decode in place while preserving the rest of the event.Test plan
docs/4-data-queries/template-transforms.md#transforms,#custom-modifiers) resolve🤖 Generated with Claude Code