fix(snippets): repair missing note column on SQLite upgrades (#1541)

src/backend/upgrade/snippets-schema-migration.ts

@@ -0,0 +1,19 @@
+import type Database from "better-sqlite3";
+
+/** Repair older SQLite tables before adoption, or after an incomplete 2.9 upgrade. */
+export function repairSnippetsNoteColumn(sqlite: Database.Database): void {
+  for (const table of ["snippets", "p_snippets_snippets"]) {
+    const columns = sqlite.pragma(`table_info("${table}")`) as Array<{
+      name: string;
+    }>;
+    if (
+      columns.length === 0 ||
+      columns.some(({ name }) => name === "is_note")
+    ) {
+      continue;
+    }
+    sqlite.exec(
+      `ALTER TABLE "${table}" ADD COLUMN "is_note" INTEGER NOT NULL DEFAULT 0`,
+    );
+  }
+}