first round of billing.sql is finished. It runs a bit slow and it de-normalizes the data, but I think it's relatively 'safe'

src/sql/0-run-first/0-functions.sql

@@ -0,0 +1,37 @@
+DROP FUNCTION IF EXISTS get_division_collapsed;
+DROP FUNCTION IF EXISTS get_division;
+
+DELIMITER /
+CREATE FUNCTION get_division_collapsed(refnum VARCHAR(15)) RETURNS VARCHAR(35)
+BEGIN
+    DECLARE type VARCHAR(35);
+    SET type = (SELECT proj_type FROM all_projects WHERE all_projects.refnum = refnum);
+    RETURN CONCAT(
+            SUBSTRING(refnum, 1, 3),
+            ' - ',
+            IF(type = 'Warranty', 'Structural', type)
+        );
+END
+/
+
+CREATE FUNCTION prettify_division(refnum VARCHAR(15), division VARCHAR(35)) RETURNS VARCHAR(35)
+BEGIN
+    RETURN CONCAT(
+            SUBSTRING(refnum, 1, 3),
+            ' - ',
+            IF(division = 'Warranty', 'Structural', division)
+        );
+END
+/
+
+CREATE FUNCTION get_division(refnum VARCHAR(15)) RETURNS VARCHAR(35)
+    RETURN CONCAT(
+            SUBSTRING(refnum, 1, 3),
+            ' - ',
+            (SELECT proj_type
+             from all_projects
+             where all_projects.refnum = refnum)
+        );
+/
+
+DELIMITER ;

src/sql/0-run-first/all_projects.sql

@@ -28,3 +28,4 @@ UNION
 SELECT * FROM SRV2021;
 
 CREATE UNIQUE INDEX ref_num ON all_projects(refnum);
+CREATE INDEX project_flavor ON all_projects(proj_type);

src/sql/0-run-first/billing.sql

@@ -0,0 +1,15 @@
+DROP TABLE IF EXISTS billing_report;
+
+CREATE TABLE billing_report AS
+SELECT pkey,
+       refNumber,
+       (SELECT all_projects.proj_type from all_projects where all_projects.refnum = refNumber) AS division,
+       line_created,
+       accepted_date,
+       (qty * default_price)             AS fee,
+       invoice_accepted
+FROM billing;
+CREATE INDEX ref_num ON billing_report(refNumber);
+
+UPDATE billing_report
+SET division = prettify_division(refNumber, division);

src/sql/0-run-first/lifecycle.sql

@@ -2,9 +2,7 @@ DROP TABLE IF EXISTS event_counts;
 
 CREATE TABLE event_counts AS
 SELECT DATE(timestamp)                             AS event_date,
-       (
-           SELECT CONCAT(SUBSTRING(all_projects.refnum, 1, 3), ' - ', IF(all_projects.proj_type = 'Warranty', 'Structural', all_projects.proj_type))
-       )                                           AS division,
+       get_division_collapsed(project_number)      AS division,
        if(substring(new_value, 1, 1) = '+', 1, -1) AS event_count,
        SUBSTRING(`new_value` FROM 2)               AS flag
 FROM project_lifecycle