-- +goose Up
-- Per-account, per-variant best single move: the highest-scoring play the account has
-- ever made in each game variant. It exists so the statistics screen can show the word
-- itself broken down by variant, not just the dimensionless aggregate
-- account_stats.max_word_points. tiles is the move's main word as an ordered JSON array of
-- {letter, value, blank} objects (value 0 and blank true for a wildcard), so the client
-- renders it as game tiles without needing the variant's alphabet table. score is the
-- play's total points (every word it formed plus the all-tiles bonus), matching
-- max_word_points. A row is replaced only by a strictly higher-scoring play. It is written
-- at game finish alongside account_stats; guest and honest-AI games never record statistics,
-- so they never write here. See docs/ARCHITECTURE.md §9.
SET search_path = backend, pg_catalog;

CREATE TABLE account_best_move (
    account_id uuid        NOT NULL REFERENCES accounts (account_id) ON DELETE CASCADE,
    variant    text        NOT NULL,
    score      integer     NOT NULL,
    tiles      jsonb       NOT NULL,
    updated_at timestamptz NOT NULL DEFAULT now(),
    PRIMARY KEY (account_id, variant)
);

-- +goose Down
SET search_path = backend, pg_catalog;
DROP TABLE IF EXISTS account_best_move;