diff --git a/README.md b/README.md
index 0558ad5..f082b1b 100644
--- a/README.md
+++ b/README.md
@@ -8,9 +8,10 @@ Repository for team IT2810-H26-T25 in IT2810-H26.
 2. [Working in this repository](#working-in-this-repository)
 3. [Project Description](#project-description)
 4. [Planned Functionality](#planned-functionality)
-5. [Stored User-Generated Data](#stored-user-generated-data)
-6. [Technology Choices](#technology-choices)
-7. [AI Usage](#ai-usage)
+5. [GraphQL API Design](#graphql-api-design)
+6. [Stored User-Generated Data](#stored-user-generated-data)
+7. [Technology Choices](#technology-choices)
+8. [AI Usage](#ai-usage)
 
 ## Running the Project
 
@@ -108,6 +109,22 @@ replaced by GraphQL queries against the backend, so that sorting and filtering
 always cover the whole dataset and not only what has been loaded in the
 browser.
 
+## GraphQL API Design
+
+The schema is in `backend/src/schema.ts`. It is a proposal: the resolvers and
+database connection are not written yet, so only `health` returns data.
+
+- `sighting(id)` returns one sighting, or null if it does not exist.
+- `sightings(search, filter, sort, first, after)` returns a page of sightings
+  with `totalCount` and `pageInfo`. Search matches city, shape and comments.
+  Filters are shape, country, state and a date range. Sort is date (newest or
+  oldest), city or shape. All of it runs in the database.
+
+**Pagination: cursor based "load more".** With about 80,000 rows, `LIMIT/OFFSET`
+gets slower the further you page, while a cursor continues from where the last
+page ended. It also fits a "load more" button, so the client only downloads
+what it shows, and Apollo Client can merge the pages into one list. The trade-off is that users cannot jump to a specific page.
+
 ## Stored User-Generated Data
 
 The main data users create are their own sighting reports. A report will have
diff --git a/backend/src/schema.ts b/backend/src/schema.ts
index 40df036..1ac4e56 100644
--- a/backend/src/schema.ts
+++ b/backend/src/schema.ts
@@ -1,12 +1,71 @@
-/**
- * Placeholder schema that only proves the server is running. The real
- * Sighting types and queries will be agreed on by the group and added
- * in a separate issue.
- */
 export const typeDefs = `#graphql
+  "A single UFO sighting report."
+  type Sighting {
+    id: ID!
+    "Local time where it was seen, no timezone, e.g. 2005-01-01T00:30:00."
+    datetime: String
+    city: String
+    state: String
+    country: String
+    shape: String
+    durationSeconds: Int
+    comments: String
+    datePosted: String
+    latitude: Float
+    longitude: Float
+  }
+
+  enum SightingSort {
+    DATE_DESC
+    DATE_ASC
+    CITY_ASC
+    SHAPE_ASC
+  }
+
+  "All fields are optional and combined with AND."
+  input SightingFilter {
+    shape: String
+    country: String
+    state: String
+    "ISO 8601 date, inclusive."
+    dateFrom: String
+    "ISO 8601 date, inclusive."
+    dateTo: String
+  }
+
+  type SightingEdge {
+    "Opaque. Pass it as \`after\` to get the next page."
+    cursor: String!
+    node: Sighting!
+  }
+
+  type PageInfo {
+    hasNextPage: Boolean!
+    endCursor: String
+  }
+
+  type SightingConnection {
+    edges: [SightingEdge!]!
+    pageInfo: PageInfo!
+    "Number of matches across all pages."
+    totalCount: Int!
+  }
+
   type Query {
     "Returns \\"ok\\" when the server is up."
     health: String!
+
+    "Returns null if the id does not exist."
+    sighting(id: ID!): Sighting
+
+    "\`search\` matches city, shape and comments. \`first\` is limited to 1-100."
+    sightings(
+      search: String
+      filter: SightingFilter
+      sort: SightingSort = DATE_DESC
+      first: Int = 20
+      after: String
+    ): SightingConnection!
   }
 `