feat: O(1) dashboard stats snapshot + maintained conflict-edge list - #415
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Remove the last whole-tenant scans from the dashboard read path so /stats and /contradictions are O(1) at any scale, cold or warm. - ScopeCounts gains growth (per-creation-month counts), maintained incrementally on store/forget like the other counts, so the growth timeline and "this month" figure are exact and O(1) with no scan. - StatsSnapshot + refresh_stats_snapshot materialize the parts that genuinely need a pass (decayed-salience health histogram, avg health, recall-count usage sums, entity/community totals) in one walk, persisted per tenant and served O(1) by stats_snapshot. The host drives the refresh from the maintenance sweep, which already walks every node for archival, so no request ever pays the O(N) cost. - The graph maintains a conflict-edge list (contradicts, supersedes) keyed by (source, target, type), so the conflict view enumerates the actual pairs in O(conflicts) instead of walking every node's out-edges (which rescans the delta log per node). Reground on compact/load; skipped on serialize since a tuple key is not a JSON map key. Tests: scope-counts growth, stats-snapshot materialize + persist across reopen, conflict-edge enumerate/maintain/persist/remove.
This was referenced Jul 30, 2026
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materialize dashboard stats snapshot and maintain a conflict-edge list