diff --git a/db/migrate/20251015122204_remove_null_constraint_from_card_not_nows_user.rb b/db/migrate/20251015122204_remove_null_constraint_from_card_not_nows_user.rb
new file mode 100644
index 000000000..854f316ca
--- /dev/null
+++ b/db/migrate/20251015122204_remove_null_constraint_from_card_not_nows_user.rb
@@ -0,0 +1,5 @@
+class RemoveNullConstraintFromCardNotNowsUser < ActiveRecord::Migration[8.1]
+  def change
+    change_column_null :card_not_nows, :user_id, true
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 828c2614a..ba76131ce 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.1].define(version: 2025_10_15_114014) do
+ActiveRecord::Schema[8.1].define(version: 2025_10_15_122204) do
   create_table "accesses", force: :cascade do |t|
     t.datetime "accessed_at"
     t.integer "collection_id", null: false
@@ -135,7 +135,7 @@ ActiveRecord::Schema[8.1].define(version: 2025_10_15_114014) do
     t.integer "card_id", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.integer "user_id", null: false
+    t.integer "user_id"
     t.index ["card_id"], name: "index_card_not_nows_on_card_id", unique: true
     t.index ["user_id"], name: "index_card_not_nows_on_user_id"
   end
diff --git a/db/schema_cache.yml b/db/schema_cache.yml
index 875b55cde..45db15cef 100644
--- a/db/schema_cache.yml
+++ b/db/schema_cache.yml
@@ -438,7 +438,16 @@ columns:
   - *5
   - *6
   - *9
-  - *18
+  - &25 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+    auto_increment:
+    name: user_id
+    cast_type: *3
+    sql_type_metadata: *4
+    'null': true
+    default:
+    default_function:
+    collation:
+    comment:
   cards:
   - *24
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
@@ -452,7 +461,7 @@ columns:
     collation:
     comment:
   - *5
-  - &25 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+  - &26 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: creator_id
     cast_type: *3
@@ -465,12 +474,12 @@ columns:
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: due_on
-    cast_type: &37 !ruby/object:ActiveRecord::Type::Date
+    cast_type: &38 !ruby/object:ActiveRecord::Type::Date
       precision:
       scale:
       limit:
       timezone:
-    sql_type_metadata: &38 !ruby/object:ActiveRecord::ConnectionAdapters::SqlTypeMetadata
+    sql_type_metadata: &39 !ruby/object:ActiveRecord::ConnectionAdapters::SqlTypeMetadata
       sql_type: date
       type: :date
       limit:
@@ -502,7 +511,7 @@ columns:
     default_function:
     collation:
     comment:
-  - &36 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+  - &37 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: title
     cast_type: *7
@@ -554,16 +563,7 @@ columns:
     collation:
     comment:
   - *9
-  - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
-    auto_increment:
-    name: user_id
-    cast_type: *3
-    sql_type_metadata: *4
-    'null': true
-    default:
-    default_function:
-    collation:
-    comment:
+  - *25
   collection_publications:
   - *24
   - *5
@@ -583,11 +583,11 @@ columns:
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: all_access
-    cast_type: &32 !ruby/object:ActiveModel::Type::Boolean
+    cast_type: &33 !ruby/object:ActiveModel::Type::Boolean
       precision:
       scale:
       limit:
-    sql_type_metadata: &33 !ruby/object:ActiveRecord::ConnectionAdapters::SqlTypeMetadata
+    sql_type_metadata: &34 !ruby/object:ActiveRecord::ConnectionAdapters::SqlTypeMetadata
       sql_type: boolean
       type: :boolean
       limit:
@@ -599,7 +599,7 @@ columns:
     collation:
     comment:
   - *5
-  - *25
+  - *26
   - *6
   - *10
   - *9
@@ -625,7 +625,7 @@ columns:
   comments:
   - *23
   - *5
-  - *25
+  - *26
   - *6
   - *9
   conversation_messages:
@@ -649,7 +649,7 @@ columns:
     default_function:
     collation:
     comment:
-  - &30 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+  - &31 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: cost_in_microcents
     cast_type: *11
@@ -748,7 +748,7 @@ columns:
   - *9
   - *18
   creators_filters:
-  - *25
+  - *26
   - *20
   entropy_configurations:
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
@@ -797,7 +797,7 @@ columns:
     comment:
   - *24
   - *5
-  - *25
+  - *26
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: eventable_id
@@ -822,11 +822,11 @@ columns:
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: particulars
-    cast_type: &26 !ruby/object:ActiveRecord::Type::Json
+    cast_type: &27 !ruby/object:ActiveRecord::Type::Json
       precision:
       scale:
       limit:
-    sql_type_metadata: &27 !ruby/object:ActiveRecord::ConnectionAdapters::SqlTypeMetadata
+    sql_type_metadata: &28 !ruby/object:ActiveRecord::ConnectionAdapters::SqlTypeMetadata
       sql_type: json
       type: :json
       limit:
@@ -840,12 +840,12 @@ columns:
   - *9
   filters:
   - *5
-  - *25
+  - *26
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: fields
-    cast_type: *26
-    sql_type_metadata: *27
+    cast_type: *27
+    sql_type_metadata: *28
     'null': false
     default: "{}"
     default_function:
@@ -865,7 +865,7 @@ columns:
   - *9
   filters_tags:
   - *20
-  - &35 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+  - &36 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: tag_id
     cast_type: *3
@@ -898,7 +898,7 @@ columns:
     default_function:
     collation:
     comment:
-  - &28 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+  - &29 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: source_id
     cast_type: *3
@@ -908,7 +908,7 @@ columns:
     default_function:
     collation:
     comment:
-  - &29 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+  - &30 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: source_type
     cast_type: *7
@@ -977,12 +977,12 @@ columns:
     default_function:
     collation:
     comment:
-  - *28
   - *29
+  - *30
   - *9
   - *18
   period_highlights:
-  - &34 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+  - &35 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: content
     cast_type: *15
@@ -992,7 +992,7 @@ columns:
     default_function:
     collation:
     comment:
-  - *30
+  - *31
   - *5
   - *6
   - *19
@@ -1037,7 +1037,7 @@ columns:
     collation:
     comment:
   - *9
-  - &31 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+  - &32 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: user_agent
     cast_type: *7
@@ -1183,21 +1183,21 @@ columns:
     collation:
     comment:
   - *9
-  - *31
+  - *32
   - *18
   steps:
   - *23
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: completed
-    cast_type: *32
-    sql_type_metadata: *33
+    cast_type: *33
+    sql_type_metadata: *34
     'null': false
     default: false
     default_function:
     collation:
     comment:
-  - *34
+  - *35
   - *5
   - *6
   - *9
@@ -1205,12 +1205,12 @@ columns:
   - *23
   - *5
   - *6
-  - *35
+  - *36
   - *9
   tags:
   - *5
   - *6
-  - *36
+  - *37
   - *9
   user_settings:
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
@@ -1253,8 +1253,8 @@ columns:
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: starts_at
-    cast_type: *37
-    sql_type_metadata: *38
+    cast_type: *38
+    sql_type_metadata: *39
     'null': false
     default:
     default_function:
@@ -1263,11 +1263,11 @@ columns:
   - *9
   - *18
   users:
-  - &40 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+  - &41 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: active
-    cast_type: *32
-    sql_type_metadata: *33
+    cast_type: *33
+    sql_type_metadata: *34
     'null': false
     default: true
     default_function:
@@ -1316,8 +1316,8 @@ columns:
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: watching
-    cast_type: *32
-    sql_type_metadata: *33
+    cast_type: *33
+    sql_type_metadata: *34
     'null': false
     default: true
     default_function:
@@ -1347,7 +1347,7 @@ columns:
     comment:
   - *6
   - *9
-  - &39 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+  - &40 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: webhook_id
     cast_type: *3
@@ -1401,9 +1401,9 @@ columns:
     collation:
     comment:
   - *9
-  - *39
-  webhooks:
   - *40
+  webhooks:
+  - *41
   - *24
   - *5
   - *6
@@ -3197,4 +3197,4 @@ indexes:
     nulls_not_distinct:
     comment:
     valid: true
-version: 20251015114014
+version: 20251015122204