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diff --git a/mod/mod-ci-github-service-data.hxx b/mod/mod-ci-github-service-data.hxx
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+++ b/mod/mod-ci-github-service-data.hxx
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+// file      : mod/mod-ci-github-serice-data.hxx -*- C++ -*-
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef MOD_MOD_CI_GITHUB_SERVICE_DATA_HXX
+#define MOD_MOD_CI_GITHUB_SERVICE_DATA_HXX
+
+#include <libbrep/types.hxx>
+#include <libbrep/utility.hxx>
+
+#include <mod/mod-ci-github-gh.hxx>
+
+namespace brep
+{
+  // Service data associated with the tenant (corresponds to GH check suite).
+  //
+  // It is always a top-level JSON object and the first member is always the
+  // schema version.
+
+  // Unsynchronized state means we were unable to (conclusively) notify
+  // GitHub about the last state transition (e.g., due to a transient
+  // network error). The "conclusively" part means that the notification may
+  // or may not have gone through. Note: node_id can be absent for the same
+  // reason.
+  //
+  struct check_run
+  {
+    string                build_id; // Full build id.
+    optional<string>      node_id;  // GitHub id.
+    build_state           state;
+    bool                  state_synced;
+
+    string
+    state_string () const
+    {
+      string r (to_string (*state));
+      if (!state_synced)
+        r += "(unsynchronized)";
+      return r;
+    }
+  };
+
+  struct service_data
+  {
+    // The data schema version. Note: must be first member in the object.
+    //
+    uint64_t version = 1;
+
+    // Check suite-global data.
+    //
+    installation_access_token installation_access;
+
+    uint64_t installation_id;
+    // @@ TODO Rename to repository_node_id.
+    //
+    string repository_id; // GitHub-internal opaque repository id.
+
+    string head_sha;
+
+    vector<check_run> check_runs;
+
+    // Return the check run with the specified build ID or nullptr if not
+    // found.
+    //
+    check_run*
+    find_check_run (const string& build_id);
+
+    // Construct from JSON.
+    //
+    // Throw invalid_argument if the schema version is not supported.
+    //
+    explicit
+    service_data (const string& json);
+
+    service_data (string iat_token,
+                  timestamp iat_expires_at,
+                  uint64_t installation_id,
+                  string repository_id,
+                  string head_sha);
+
+    service_data () = default;
+
+    // Serialize to JSON.
+    //
+    string
+    json () const;
+  };
+
+  ostream&
+  operator<< (ostream&, const service_data::check_run&);
+}
+
+#endif // MOD_MOD_CI_GITHUB_SERVICE_DATA_HXX