diff --git a/migrations/config/intermediate_db.yml b/migrations/config/intermediate_db.yml
index b3300526e1e..004dbe54b86 100644
--- a/migrations/config/intermediate_db.yml
+++ b/migrations/config/intermediate_db.yml
@@ -41,6 +41,8 @@ schema:
         - name: "id"
           datatype: numeric
           rename_to: "original_id"
+        - name: "created_at"
+          nullable: true
         - name_regex: ".*upload.*_id$"
           datatype: text
         - name_regex: ".*_id$"
diff --git a/migrations/config/json_schemas/db_schema.json b/migrations/config/json_schemas/db_schema.json
index 7fecc9b887b..91f2dcf51b2 100644
--- a/migrations/config/json_schemas/db_schema.json
+++ b/migrations/config/json_schemas/db_schema.json
@@ -83,12 +83,26 @@
                         },
                         "datatype": {
                           "$ref": "#/$defs/datatypes"
+                        },
+                        "nullable": {
+                          "type": "boolean"
                         }
                       },
                       "additionalProperties": false,
                       "required": [
-                        "name",
-                        "datatype"
+                        "name"
+                      ],
+                      "anyOf": [
+                        {
+                          "required": [
+                            "datatype"
+                          ]
+                        },
+                        {
+                          "required": [
+                            "nullable"
+                          ]
+                        }
                       ]
                     }
                   },
@@ -191,6 +205,9 @@
                       },
                       "rename_to": {
                         "type": "string"
+                      },
+                      "nullable": {
+                        "type": "boolean"
                       }
                     },
                     "additionalProperties": false,
@@ -204,6 +221,11 @@
                         "required": [
                           "rename_to"
                         ]
+                      },
+                      {
+                        "required": [
+                          "nullable"
+                        ]
                       }
                     ],
                     "oneOf": [
diff --git a/migrations/db/intermediate_db_schema/100-base-schema.sql b/migrations/db/intermediate_db_schema/100-base-schema.sql
index 01af108251a..7003e6c2770 100644
--- a/migrations/db/intermediate_db_schema/100-base-schema.sql
+++ b/migrations/db/intermediate_db_schema/100-base-schema.sql
@@ -5,7 +5,7 @@
 CREATE TABLE user_emails
 (
     email      TEXT     NOT NULL PRIMARY KEY,
-    created_at DATETIME NOT NULL,
+    created_at DATETIME,
     "primary"  BOOLEAN,
     user_id    NUMERIC  NOT NULL
 );
@@ -80,7 +80,7 @@ CREATE TABLE users
     approved                  BOOLEAN,
     approved_at               DATETIME,
     approved_by_id            NUMERIC,
-    created_at                DATETIME  NOT NULL,
+    created_at                DATETIME,
     date_of_birth             DATE,
     first_seen_at             DATETIME,
     flair_group_id            NUMERIC,
diff --git a/migrations/lib/database/intermediate_db/user.rb b/migrations/lib/database/intermediate_db/user.rb
index 01a1c079d32..583b78646a1 100644
--- a/migrations/lib/database/intermediate_db/user.rb
+++ b/migrations/lib/database/intermediate_db/user.rb
@@ -48,7 +48,7 @@ module Migrations::Database::IntermediateDB
       approved: nil,
       approved_at: nil,
       approved_by_id: nil,
-      created_at:,
+      created_at: nil,
       date_of_birth: nil,
       first_seen_at: nil,
       flair_group_id: nil,
diff --git a/migrations/lib/database/intermediate_db/user_email.rb b/migrations/lib/database/intermediate_db/user_email.rb
index e8ec92938d8..eab72dcfd38 100644
--- a/migrations/lib/database/intermediate_db/user_email.rb
+++ b/migrations/lib/database/intermediate_db/user_email.rb
@@ -18,7 +18,7 @@ module Migrations::Database::IntermediateDB
       )
     SQL
 
-    def self.create(email:, created_at:, primary: nil, user_id:)
+    def self.create(email:, created_at: nil, primary: nil, user_id:)
       ::Migrations::Database::IntermediateDB.insert(
         SQL,
         email,
diff --git a/migrations/lib/database/schema/global_config.rb b/migrations/lib/database/schema/global_config.rb
index a1d2f1c8d5d..9d8ef793e7c 100644
--- a/migrations/lib/database/schema/global_config.rb
+++ b/migrations/lib/database/schema/global_config.rb
@@ -27,6 +27,12 @@ module Migrations::Database::Schema
       end
     end
 
+    def modified_nullable(column_name)
+      if (modified_column = find_modified_column(column_name))
+        modified_column[:nullable]
+      end
+    end
+
     private
 
     def find_modified_column(column_name)
diff --git a/migrations/lib/database/schema/loader.rb b/migrations/lib/database/schema/loader.rb
index 765f6734d04..702d44f5d9a 100644
--- a/migrations/lib/database/schema/loader.rb
+++ b/migrations/lib/database/schema/loader.rb
@@ -45,7 +45,7 @@ module Migrations::Database::Schema
           Column.new(
             name: name_for(column),
             datatype: datatype_for(column),
-            nullable: column.null || column.default,
+            nullable: nullable_for(column, config),
             max_length: column.type == :text ? column.limit : nil,
             is_primary_key: primary_key_column_names.include?(column.name),
           )
@@ -102,6 +102,16 @@ module Migrations::Database::Schema
       end
     end
 
+    def nullable_for(column, config)
+      modified_column = config.dig(:columns, :modify)&.find { |col| col[:name] == column.name }
+      return modified_column[:nullable] if modified_column&.key?(:nullable)
+
+      global_nullable = @global.modified_nullable(column.name)
+      return global_nullable unless global_nullable.nil?
+
+      column.null || column.default.present?
+    end
+
     def indexes(config)
       config[:indexes]&.map do |index|
         Index.new(