Updated A LOT

server/services/ruleSets.js

@@ -0,0 +1,25 @@
+const { one, parseJson } = require('../db');
+
+function activeRuleSet() {
+  const row = one('SELECT rules_json FROM tax_rule_sets WHERE active = 1 ORDER BY effective_date DESC, id DESC LIMIT 1');
+  return row ? parseJson(row.rules_json, {}) : {};
+}
+
+// Resolve the depreciation rule set a book should use: its explicitly assigned
+// rule set when present, otherwise the globally active set.
+function ruleSetForBook(bookCode) {
+  if (bookCode) {
+    try {
+      const book = one('SELECT tax_rule_set_id FROM books WHERE code = ?', [bookCode]);
+      if (book && book.tax_rule_set_id) {
+        const row = one('SELECT rules_json FROM tax_rule_sets WHERE id = ?', [book.tax_rule_set_id]);
+        if (row) return parseJson(row.rules_json, {});
+      }
+    } catch {
+      // books table may not exist on a very old database; fall through to active set
+    }
+  }
+  return activeRuleSet();
+}
+
+module.exports = { activeRuleSet, ruleSetForBook };