feat: sql-tools overrides (#19796)

server/src/sql-tools/comparers/override.comparer.ts

@@ -0,0 +1,29 @@
+import { Comparer, DatabaseOverride, Reason } from 'src/sql-tools/types';
+
+export const compareOverrides: Comparer<DatabaseOverride> = {
+  onMissing: (source) => [
+    {
+      type: 'OverrideCreate',
+      override: source,
+      reason: Reason.MissingInTarget,
+    },
+  ],
+  onExtra: (target) => [
+    {
+      type: 'OverrideDrop',
+      overrideName: target.name,
+      reason: Reason.MissingInSource,
+    },
+  ],
+  onCompare: (source, target) => {
+    if (source.value.name !== target.value.name || source.value.sql !== target.value.sql) {
+      const sourceValue = JSON.stringify(source.value);
+      const targetValue = JSON.stringify(target.value);
+      return [
+        { type: 'OverrideUpdate', override: source, reason: `value is different (${sourceValue} vs ${targetValue})` },
+      ];
+    }
+
+    return [];
+  },
+};