Fixed #26808 -- Added Meta.indexes for class-based indexes.

* Added the index name to its deconstruction.
* Added indexes to sqlite3.schema._remake_table() so that indexes
  aren't dropped when _remake_table() is called.

Thanks timgraham & MarkusH for review and advice.

docs/ref/migration-operations.txt

@@ -202,22 +202,6 @@ is set, its column name).
 Creates an index in the database table for the model with ``model_name``.
 ``index`` is an instance of the :class:`~django.db.models.Index` class.
 
-For example, to add an index on the ``title`` and ``author`` fields of the
-``Book`` model::
-
-    from django.db import migrations, models
-
-    class Migration(migrations.Migration):
-        operations = [
-            migrations.AddIndex(
-                'Book',
-                models.Index(fields=['title', 'author'], name='my_index_name'),
-            ),
-        ]
-
-If you're writing your own migration to add an index, you must assign a
-``name`` to the ``index`` as done above.
-
 ``RemoveIndex``
 ---------------
 

docs/ref/models/indexes.txt

@@ -8,8 +8,10 @@ Model index reference
 
 .. versionadded:: 1.11
 
-Index classes ease creating database indexes. This document explains the API
-references of :class:`Index` which includes the `index options`_.
+Index classes ease creating database indexes. They can be added using the
+:attr:`Meta.indexes <django.db.models.Options.indexes>` option. This document
+explains the API references of :class:`Index` which includes the `index
+options`_.
 
 .. admonition:: Referencing built-in indexes
 
@@ -40,9 +42,3 @@ A list of the name of the fields on which the index is desired.
 The name of the index. If ``name`` isn't provided Django will auto-generate a
 name. For compatibility with different databases, index names cannot be longer
 than 30 characters and shouldn't start with a number (0-9) or underscore (_).
-
-.. seealso::
-
-    Use the :class:`~django.db.migrations.operations.AddIndex` and
-    :class:`~django.db.migrations.operations.RemoveIndex` operations to add
-    and remove indexes.

docs/ref/models/options.txt

@@ -390,6 +390,28 @@ Django quotes column and table names behind the scenes.
     See :meth:`django.db.models.Model.save()` for more about the old and
     new saving algorithm.
 
+``indexes``
+-----------
+
+.. attribute:: Options.indexes
+
+    .. versionadded:: 1.11
+
+    A list of :doc:`indexes </ref/models/indexes>` that you want to define on
+    the model::
+
+        from django.db import models
+
+        class Customer(models.Model):
+            first_name = models.CharField(max_length=100)
+            last_name = models.CharField(max_length=100)
+
+            class Meta:
+                indexes = [
+                    models.Index(fields=['last_name', 'first_name']),
+                    models.Index(fields=['first_name'], name='first_name_idx'),
+                ]
+
 ``unique_together``
 -------------------