test: refactor suite to use AsyncClient, in-memory DBs, and parallel coverage

tests/api/test_schemathesis.py

@@ -11,6 +11,7 @@ replace the checks list with the default (remove the argument) for full complian
 Requires DECNET_DEVELOPER=true (set in tests/conftest.py) to expose /openapi.json.
 """
 import schemathesis
+from hypothesis import settings
 from schemathesis.checks import not_a_server_error
 from decnet.web.api import app
 
@@ -18,5 +19,6 @@ schema = schemathesis.openapi.from_asgi("/openapi.json", app)
 
 
 @schemathesis.pytest.parametrize(api=schema)
+@settings(max_examples=5, deadline=None)
 def test_schema_compliance(case):
     case.call_and_validate(checks=[not_a_server_error])