Rijad Zuzo
63 lines
2.3 KiB
Markdown
63 lines
2.3 KiB
Markdown
# The Steward — Economic Event Stream
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## Current contract
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Every successful food movement creates one `EconomicEventRecord`:
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```text
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resource_extracted
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storage_deposited
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storage_withdrawn
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item_consumed
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```
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Each record contains a monotonically increasing event ID, event type,
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simulation tick, actor ID, source ID, destination ID, item ID, and transferred
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amount. Actor `-1` identifies a player-triggered extraction until persistent
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player identity is introduced.
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Events are immutable facts about completed transfers. They do not perform the
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transaction and are not replayed to reconstruct current state. Resource,
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inventory, and storage records remain authoritative.
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`SimulationEventLog` owns ordered event identity, append/restore behavior, and
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history/rate queries. `VillageEconomy` performs transactions and requests event
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records only after state changes succeed; `SimulationManager` remains the
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public signal boundary used by presentation.
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An action whose definition-backed completion cost becomes unavailable records
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a zero-amount `task_blocked` narrative fact with the action and shortfall
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reason. This makes late contention inspectable without pretending that a
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transfer occurred.
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## Persistence and determinism
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`SimulationStateRecord` schema v3 stores the ordered event stream and
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`next_event_id`. Schema v1 and v2 saves migrate to an empty stream beginning at
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ID zero. Parsing rejects duplicate event IDs and a next ID that could collide
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with restored history.
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The food-loop regression verifies this chain:
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```text
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bush -> NPC inventory -> village pantry -> NPC inventory -> consumed
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```
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It checks event order, stable IDs, exact quantities, conservation, and
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save/restore continuity.
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## Presentation
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`npc_inventory_changed` is a transient presentation signal. The active
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`NpcVisual` shows a small food sack whenever its authoritative inventory
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contains food. A newly loaded visual derives the same state directly from the
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NPC record, so unloading presentation does not lose the fact.
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## Deliberate limits
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The stream is currently kept in full for the small simulation garden. Before
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large populations or long-running worlds, add measured retention,
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archival/summary rules, and query indexes. General denied attempts, witnesses,
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secrecy, causal links, and memories belong in later event/history slices; they
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should extend this record family without making prose authoritative.
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