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36 lines
1.3 KiB
SQL
36 lines
1.3 KiB
SQL
-- Migration: Change median calculation from 12 weeks to 4 weeks
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-- Date: 2026-02-02
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--
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-- This migration updates projects_median_mv to calculate median based on
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-- the last 4 weeks instead of 12 weeks.
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DROP MATERIALIZED VIEW IF EXISTS projects_median_mv;
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CREATE MATERIALIZED VIEW projects_median_mv AS
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SELECT
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p.id AS project_id,
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p.user_id,
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PERCENTILE_CONT(0.5) WITHIN GROUP (ORDER BY normalized_total_score) AS median_score
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FROM (
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SELECT
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project_id,
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normalized_total_score,
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report_year,
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report_week,
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ROW_NUMBER() OVER (PARTITION BY project_id ORDER BY report_year DESC, report_week DESC) as rn
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FROM weekly_report_mv
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WHERE
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(report_year < EXTRACT(ISOYEAR FROM CURRENT_DATE)::INTEGER)
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OR (report_year = EXTRACT(ISOYEAR FROM CURRENT_DATE)::INTEGER
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AND report_week < EXTRACT(WEEK FROM CURRENT_DATE)::INTEGER)
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) sub
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JOIN projects p ON p.id = sub.project_id
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WHERE rn <= 4 AND p.deleted = FALSE
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GROUP BY p.id, p.user_id
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WITH DATA;
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CREATE INDEX idx_projects_median_mv_project_id ON projects_median_mv(project_id);
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CREATE INDEX idx_projects_median_mv_user_id ON projects_median_mv(user_id);
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COMMENT ON MATERIALIZED VIEW projects_median_mv IS 'Materialized view calculating median score for each project based on last 4 weeks of historical data. Includes user_id for multi-tenant support.';
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