Scaffolding for diagnostic function(s)

scripts-available/CDB_FederatedServerDiagnostics.sql

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+--------------------------------------------------------------------------------
+-- Public functions
+--------------------------------------------------------------------------------
+
+CREATE OR REPLACE FUNCTION @extschema@.CDB_Federated_Server_Diagnostics(server TEXT)
+RETURNS json -- TODO decide if json or jsonb
+AS $$
+BEGIN
+    RETURN '{}'::json;
+END
+$$
+LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;

scripts-enabled/403-CDB_FederatedServerDiagnostics.sql

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+../scripts-available/CDB_FederatedServerDiagnostics.sql

test/CDB_FederatedServerDiagnostics.sql

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+\echo '%% It raises an error if the server does not exist'
+SELECT '1.1', cartodb.CDB_Federated_Server_Diagnostics(server => 'doesNotExist');

test/CDB_FederatedServerDiagnostics_expect

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+%% It raises an error if the server does not exist
+1.1|{}