Provenance & time-travel
Two questions ordinary stores can't answer. Wadachi can, because it never throws anything away.
why — interrogating decisions
why("why do we use pandoc for the pdfs?")
Searches Decisions, returns for each match:
| field | content |
|---|---|
| decided | what was chosen |
| why | the rationale, verbatim from when it was fresh |
| rejected_alternatives | what you gave up, and why |
| context | the situation at the time |
| when | date |
| cited_by | memories referencing this decision — graph evidence |
The last field is the special one: it's walked from the typed The typed knowledge graph, so you see not just the decision but its footprint in your knowledge.
as_of — the brain at a past date
as_of("2026-03-01", query="deploy pipeline")
Returns memories that existed on that date, each with:
status_at_date— active · already superseded by #N (if the successor existed by then) · expired (past its valid-until);content_as_of— the content as it was on that date, reconstructed from the non-destructive version history (Memories).
Ask "what did we believe in March?" and get March's answer — not today's memories cosplaying as March's.
Why this works
Three mechanisms compound: every update snapshots the previous version; supersession is a dated, typed edge instead of a deletion; and beliefs carry validity windows. History isn't a backup you restore — it's a dimension you query.