GraphQL bugfix + query samples

Events.GraphQL/graphql-cheat-sheet.md

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+# GraphQL Cheat Sheet
+
+Use endpoint: `/graphql`
+
+## Available queries
+
+- `countries`
+- `sports`
+- `people`
+- `peoplePage(pageNumber, pageSize)`
+- `events`
+- `eventsForDate(date)`
+- `registrations`
+
+## Common arguments
+
+- paging: `first`, `after`, `last`, `before`
+- filtering: `where`
+- sorting: `order`
+
+## Quick examples
+
+### Get events
+
+```graphql
+query {
+  events(first: 5) {
+    nodes {
+      id
+      name
+      eventDate
+    }
+  }
+}
+```
+
+### Filter people by country
+
+```graphql
+query {
+  people(where: { countryCode: { eq: "HR" } }, first: 10) {
+    nodes {
+      id
+      firstName
+      lastName
+    }
+  }
+}
+```
+
+### Sort sports by name
+
+```graphql
+query {
+  sports(order: [{ name: ASC }], first: 10) {
+    nodes {
+      id
+      name
+    }
+  }
+}
+```
+
+### Events for a specific date
+
+```graphql
+query {
+  eventsForDate(date: "2026-06-15", first: 10) {
+    nodes {
+      id
+      name
+    }
+  }
+}
+```
+
+### Classic paging with `peoplePage`
+
+```graphql
+query {
+  peoplePage(pageNumber: 1, pageSize: 5) {
+    totalCount
+    items {
+      id
+      firstName
+      lastName
+    }
+  }
+}
+```
+
+## Mutations
+
+- `addEvent(input)`
+- `updateEvent(id, input)`
+- `deleteEvent(id)`