play-life/play-life-backend/migrations/006_fix_weekly_report_mv_structure.sql

-- Migration: Fix weekly_report_mv structure to include all projects via LEFT JOIN
-- This ensures the view structure matches the code in main.go
-- Date: 2024-12-29
--
-- Issue: Migration 005 created the view without LEFT JOIN to projects table,
-- which means projects without data were not included in the view.
-- This migration fixes the structure to match main.go implementation.

-- Drop existing materialized view
DROP MATERIALIZED VIEW IF EXISTS weekly_report_mv;

-- Recreate materialized view with correct structure (LEFT JOIN with projects)
-- This ensures all projects are included, even if they have no data for a given week
CREATE MATERIALIZED VIEW weekly_report_mv AS
SELECT
    p.id AS project_id,
    agg.report_year,
    agg.report_week,
    COALESCE(agg.total_score, 0.0000) AS total_score
FROM
    projects p
LEFT JOIN 
    (
        SELECT
            n.project_id,
            EXTRACT(ISOYEAR FROM e.created_date)::INTEGER AS report_year,
            EXTRACT(WEEK FROM e.created_date)::INTEGER AS report_week,
            SUM(n.score) AS total_score
        FROM
            nodes n
        JOIN
            entries e ON n.entry_id = e.id
        GROUP BY
            1, 2, 3
    ) agg 
    ON p.id = agg.project_id
WHERE
    p.deleted = FALSE
ORDER BY
    p.id, agg.report_year, agg.report_week
WITH DATA;

-- Recreate index
CREATE INDEX IF NOT EXISTS idx_weekly_report_mv_project_year_week 
    ON weekly_report_mv(project_id, report_year, report_week);

COMMENT ON MATERIALIZED VIEW weekly_report_mv IS 'Materialized view aggregating weekly scores by project using ISOYEAR for correct week calculations at year boundaries. Includes all projects via LEFT JOIN.';