Remove db_index, add meta index

src/registrar/models/contact.py

@@ -8,6 +8,13 @@ from phonenumber_field.modelfields import PhoneNumberField  # type: ignore
 class Contact(TimeStampedModel):
     """Contact information follows a similar pattern for each contact."""
 
+    class Meta:
+        """Contains meta information about this class"""
+        indexes = [
+            models.Index(fields=["user"]),
+            models.Index(fields=["email"]),
+        ]
+
     user = models.OneToOneField(
         "registrar.User",
         null=True,
@@ -19,7 +26,6 @@ class Contact(TimeStampedModel):
         null=True,
         blank=True,
         verbose_name="first name",
-        db_index=True,
     )
     middle_name = models.CharField(
         null=True,
@@ -29,7 +35,6 @@ class Contact(TimeStampedModel):
         null=True,
         blank=True,
         verbose_name="last name",
-        db_index=True,
     )
     title = models.CharField(
         null=True,
@@ -39,13 +44,11 @@ class Contact(TimeStampedModel):
     email = models.EmailField(
         null=True,
         blank=True,
-        db_index=True,
         max_length=320,
     )
     phone = PhoneNumberField(
         null=True,
         blank=True,
-        db_index=True,
     )
 
     def _get_all_relations(self):

src/registrar/models/domain.py

@@ -65,6 +65,13 @@ class Domain(TimeStampedModel, DomainHelper):
        domain meets the required checks.
     """
 
+    class Meta:
+        """Contains meta information about this class"""
+        indexes = [
+            models.Index(fields=["name"]),
+        ]
+
+
     def __init__(self, *args, **kwargs):
         self._cache = {}
         super(Domain, self).__init__(*args, **kwargs)

src/registrar/models/domain_information.py

@@ -22,6 +22,14 @@ class DomainInformation(TimeStampedModel):
     the domain request once approved, so copying them that way we can make changes
     after its approved. Most fields here are copied from DomainRequest."""
 
+    class Meta:
+        """Contains meta information about this class"""
+        indexes = [
+            models.Index(fields=["domain"]),
+            models.Index(fields=["domain_request"]),
+            models.Index(fields=["generic_org_type"]),
+        ]
+
     StateTerritoryChoices = DomainRequest.StateTerritoryChoices
 
     # use the short names in Django admin
@@ -120,7 +128,6 @@ class DomainInformation(TimeStampedModel):
     organization_name = models.CharField(
         null=True,
         blank=True,
-        db_index=True,
     )
     address_line1 = models.CharField(
         null=True,
@@ -147,7 +154,6 @@ class DomainInformation(TimeStampedModel):
         max_length=10,
         null=True,
         blank=True,
-        db_index=True,
         verbose_name="zip code",
     )
     urbanization = models.CharField(

src/registrar/models/domain_request.py

@@ -24,6 +24,15 @@ logger = logging.getLogger(__name__)
 class DomainRequest(TimeStampedModel):
     """A registrant's domain request for a new domain."""
 
+    class Meta:
+        """Contains meta information about this class"""
+        indexes = [
+            models.Index(fields=["requested_domain"]),
+            models.Index(fields=["approved_domain"]),
+            models.Index(fields=["status"]),
+            models.Index(fields=["generic_org_type"]),
+        ]
+
     # https://django-auditlog.readthedocs.io/en/latest/usage.html#object-history
     # If we note any performace degradation due to this addition,
     # we can query the auditlogs table in admin.py and add the results to
@@ -537,7 +546,6 @@ class DomainRequest(TimeStampedModel):
     organization_name = models.CharField(
         null=True,
         blank=True,
-        db_index=True,
     )
 
     address_line1 = models.CharField(
@@ -566,7 +574,6 @@ class DomainRequest(TimeStampedModel):
         null=True,
         blank=True,
         verbose_name="zip code",
-        db_index=True,
     )
     urbanization = models.CharField(
         null=True,

src/registrar/models/transition_domain.py

@@ -59,7 +59,6 @@ class TransitionDomain(TimeStampedModel):
         null=True,
         blank=True,
         help_text="Organization name",
-        db_index=True,
     )
     federal_type = models.CharField(
         max_length=50,
@@ -85,7 +84,6 @@ class TransitionDomain(TimeStampedModel):
         blank=True,
         help_text="First name / given name",
         verbose_name="first name",
-        db_index=True,
     )
     middle_name = models.CharField(
         null=True,
@@ -136,7 +134,6 @@ class TransitionDomain(TimeStampedModel):
         blank=True,
         verbose_name="zip code",
         help_text="Zip code",
-        db_index=True,
     )
 
     def __str__(self):

src/registrar/models/user.py

@@ -70,7 +70,6 @@ class User(AbstractUser):
         null=True,
         blank=True,
         help_text="Phone",
-        db_index=True,
     )
 
     verification_type = models.CharField(

src/registrar/models/verified_by_staff.py

@@ -9,7 +9,6 @@ class VerifiedByStaff(TimeStampedModel):
     email = models.EmailField(
         null=False,
         blank=False,
-        db_index=True,
     )
 
     requestor = models.ForeignKey(