evelyn-status-index-history Specification

Purpose

Provide typed historical Evelyn status measurements and make all six indexes visible over time in Mission Control.

Requirements

Requirement: Evelyn provides historical status-index measurements

Evelyn SHALL expose a non-null list of typed measurement points ordered from oldest to newest. Each point SHALL contain a timestamp, Evelyn Price Index, EVE_SYRUP Pool Depth Index, EVE_SYRUP Pool Balance Index, AAZDKK_USDT Pool Balance Index, AAZDKK_USDT Pool Price Index, and AAZDKK_USDT Pool Depth Index; the list MAY be empty.

Scenario: Status-index history is requested

WHEN a caller requests Evelyn's status-index history
THEN Evelyn returns a non-null, oldest-to-newest list whose points contain a timestamp and all six index values

Requirement: Evelyn Mission Control visualizes status-index measurements

Evelyn Mission Control SHALL display historical measurements from separate Production and Test Evelyn references in their corresponding Overview tabs as six-line graphs, with timestamp on the X-axis and index value on the Y-axis. Each environment SHALL retrieve its own history and SHALL have a separate graph instance with a dynamic Y-axis range that is symmetric around zero and always displays zero as the desired state. The two histories MAY contain identical values but SHALL remain separate data sources.

Scenario: Production and Test Overviews are created with history

WHEN Mission Control creates the Production and Test Overview views
THEN it retrieves history from the corresponding Production and Test Evelyn references and creates a separate six-line graph for each environment whose symmetric Y-axis contains zero

Scenario: An environment has empty history

WHEN Mission Control creates an environment's Overview view and that environment's Evelyn history is empty
THEN it displays an empty six-series graph for that environment whose Y-axis still contains zero without substituting the other environment's history

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