feat: add last pipeline report on scm table (#375)

Signed-off-by: Olivier Vernin <olivier@vernin.me>

Author: olblak

pkg/database/migrations/000009_alter_scms_last_pipeline_report_at.down.sql

@@ -0,0 +1,7 @@
+BEGIN;
+DROP TRIGGER IF EXISTS trg_sync_scms_last_pipeline_report_at ON pipelineReports;
+DROP FUNCTION IF EXISTS sync_scms_last_pipeline_report_at();
+
+ALTER TABLE scms
+    DROP COLUMN IF EXISTS last_pipeline_report_at;
+COMMIT;

pkg/database/migrations/000009_alter_scms_last_pipeline_report_at.up.sql

@@ -0,0 +1,24 @@
+-- This migration adds a timestamp column to the scms table and keeps it
+-- synchronized with the latest pipeline report creation time for linked SCMs.
+BEGIN;
+ALTER TABLE scms
+    ADD COLUMN IF NOT EXISTS last_pipeline_report_at TIMESTAMP;
+
+CREATE OR REPLACE FUNCTION sync_scms_last_pipeline_report_at()
+RETURNS TRIGGER AS $$
+BEGIN
+    UPDATE scms
+    SET last_pipeline_report_at = NEW.created_at
+    WHERE id = ANY(NEW.target_db_scm_ids);
+
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+DROP TRIGGER IF EXISTS trg_sync_scms_last_pipeline_report_at ON pipelineReports;
+CREATE TRIGGER trg_sync_scms_last_pipeline_report_at
+AFTER INSERT ON pipelineReports
+FOR EACH ROW
+WHEN (array_length(NEW.target_db_scm_ids, 1) IS NOT NULL)
+EXECUTE FUNCTION sync_scms_last_pipeline_report_at();
+COMMIT;