querylog: the aside file's name says why, so a schema change is not called corrupt

src/storage/storage_integration_test.zig

@@ -190,7 +190,7 @@ fn countLines(text: []const u8) usize {
 // querylog aside files
 // ---------------------------------------------------------------------------
 
-const aside_prefix = "querylog.db.corrupt-";
+const aside_prefix = "querylog.db.";
 
 const Names = struct {
     items: std.ArrayList([]u8),
@@ -412,6 +412,10 @@ test "S7 case 3: a wrong user_version recreates and keeps the old file aside" {
     defer asides.deinit();
     try testing.expectEqual(@as(usize, 1), asides.items.items.len);
 
+    // The file was healthy: this build's schema moved, the database did not rot.
+    // An operator who reads "corrupt" here deletes a file that was never broken.
+    try testing.expect(std.mem.startsWith(u8, asides.items.items[0], "querylog.db.schema-changed-"));
+
     const kept = try f.read(asides.items.items[0]);
     defer testing.allocator.free(kept);
     try testing.expectEqualSlices(u8, original, kept);
@@ -441,6 +445,12 @@ test "S7 case 4: a garbage file recreates and the garbage is preserved" {
     defer asides.deinit();
     try testing.expectEqual(@as(usize, 1), asides.items.items.len);
 
+    const expected: []const u8 = if (reason == .corrupt)
+        "querylog.db.corrupt-"
+    else
+        "querylog.db.not-a-database-";
+    try testing.expect(std.mem.startsWith(u8, asides.items.items[0], expected));
+
     const kept = try f.read(asides.items.items[0]);
     defer testing.allocator.free(kept);
     try testing.expectEqualSlices(u8, &garbage, kept);