Remove old examples.tutorial schema

docs/explanation/selecting-populations-for-study.md

@@ -26,4 +26,4 @@ for further details of this transfer process.
     a patient did not change practice during a time period of interest.
 
     For TPP,
-    there is a [method to select patients with a continuous registration](../reference/schemas/tpp.md#practice_registrations.has_a_continuous_practice_registration_spanning).
+    there is a [method to select patients with a continuous registration](../reference/schemas/tpp.md#practice_registrations.spanning).

docs/includes/generated_docs/language__dataset.md

@@ -38,7 +38,7 @@ dataset.define_population(patients.date_of_birth < "1990-01-01")
 ```
 
 For more detail see the how-to guide on [defining
-populations](../../how-to/define-population/).
+populations](../how-to/define-population.md).
 </div>
 
 <div class="attr-heading" id="Dataset.add_column">

docs/includes/generated_docs/schemas.md

@@ -31,15 +31,6 @@ This schema defines the data (both primary care and externally linked) available
 OpenSAFELY-EMIS backend. For more information about this backend, see
 "[EMIS Primary Care](https://docs.opensafely.org/data-sources/emis/)".
 
-## [examples.tutorial](schemas/examples.tutorial.md)
-<small class="subtitle">
-  <a href="./examples.tutorial/"> view details → </a>
-</small>
-
-_This schema is for development or testing purposes and is not available on any backend._
-
-This example schema is for use in the ehrQL tutorial.
-
 ## [raw.core](schemas/raw.core.md)
 <small class="subtitle">
   <a href="./raw.core/"> view details → </a>

docs/includes/generated_docs/schemas/tpp.md

@@ -3035,7 +3035,7 @@ The priority type.
 Note that a small number of rows contain values which are not in the list
 below. These are converted to NULL in this representation of the data. If
 you need to access the original values, please see the corresponding [raw
-table](../raw.tpp/#wl_clockstops).
+table](raw.tpp.md#wl_clockstops).
 
  * Possible values: `routine`, `urgent`, `two week wait`
   </dd>
@@ -3137,7 +3137,7 @@ The waiting list type on completion of the pathway.
 Note that a small number of rows contain values which are not in the list
 below. These are converted to NULL in this representation of the data. If
 you need to access the original values, please see the corresponding [raw
-table](../raw.tpp/#wl_clockstops).
+table](raw.tpp.md#wl_clockstops).
 
  * Possible values: `ORTT`, `IRTT`, `PTLO`, `PTLI`, `RTTO`, `RTTI`
   </dd>
@@ -3222,7 +3222,7 @@ The priority type.
 Note that a small number of rows contain values which are not in the list
 below. These are converted to NULL in this representation of the data. If
 you need to access the original values, please see the corresponding [raw
-table](../raw.tpp/#wl_openpathways).
+table](raw.tpp.md#wl_openpathways).
 
  * Possible values: `routine`, `urgent`, `two week wait`
   </dd>
@@ -3325,7 +3325,7 @@ The waiting list type.
 Note that a small number of rows contain values which are not in the list
 below. These are converted to NULL in this representation of the data. If
 you need to access the original values, please see the corresponding [raw
-table](../raw.tpp/#wl_openpathways).
+table](raw.tpp.md#wl_openpathways).
 
  * Possible values: `ORTT`, `IRTT`, `ONON`, `INON`, `PTLO`, `PTLI`, `RTTO`, `RTTI`
   </dd>

ehrql/docs/render_includes/schemas.py

@@ -21,11 +21,7 @@ def render_schema_index(schemas):
 
 
 def implemented_by_list(backends, depth=1):
-    if not backends:
-        return (
-            "_This schema is for development or testing purposes and is not"
-            " available on any backend._"
-        )
+    assert len(backends) > 0
     if depth > 1:
         url_prefix = "/".join([".."] * (depth - 1)) + "/"
     else:

ehrql/query_language.py

@@ -68,7 +68,7 @@ def define_population(self, population_condition):
         ```
 
         For more detail see the how-to guide on [defining
-        populations](../../how-to/define-population/).
+        populations](../how-to/define-population.md).
         """
         if "population" in self.variables:
             raise AttributeError(