diff --git a/caddy/certificates/local/localhost/localhost.crt b/caddy/certificates/local/localhost/localhost.crt
deleted file mode 100644
index 59c70337..00000000
--- a/caddy/certificates/local/localhost/localhost.crt
+++ /dev/null
@@ -1,24 +0,0 @@
------BEGIN CERTIFICATE-----
-MIIBvjCCAWSgAwIBAgIRAPdWIXAQxTVrUX91KwNIF+QwCgYIKoZIzj0EAwIwMzEx
-MC8GA1UEAxMoQ2FkZHkgTG9jYWwgQXV0aG9yaXR5IC0gRUNDIEludGVybWVkaWF0
-ZTAeFw0yNjAyMjYyMzAxNDBaFw0yNjAyMjcxMTAxNDBaMAAwWTATBgcqhkjOPQIB
-BggqhkjOPQMBBwNCAARR62QzBOPHe2TGm38ierFl8d2BI5OqK5+bZlC7oFlTjnPK
-Nc2tNIwWRQN7s/mgjGofTEbhXtKlsOiszWkppUcGo4GLMIGIMA4GA1UdDwEB/wQE
-AwIHgDAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwHQYDVR0OBBYEFC0i
-0sUQgvKT33Axf7y9FTBLeznsMB8GA1UdIwQYMBaAFOxV1t5PNPDTh9m0kAThczd3
-NAuOMBcGA1UdEQEB/wQNMAuCCWxvY2FsaG9zdDAKBggqhkjOPQQDAgNIADBFAiAS
-3iwjQZjzoDgxqWD1zb9i53RDBwGhAZljCQk3JUI+sQIhAOKGxVb62B3PNzHIFl8P
-2ODSM4VcXQLRyglVBgAj6hK2
------END CERTIFICATE-----
------BEGIN CERTIFICATE-----
-MIIBxzCCAW6gAwIBAgIRAI0iQ73L7bHafZWUPizI2TQwCgYIKoZIzj0EAwIwMDEu
-MCwGA1UEAxMlQ2FkZHkgTG9jYWwgQXV0aG9yaXR5IC0gMjAyNiBFQ0MgUm9vdDAe
-Fw0yNjAyMjYyMzAxNDBaFw0yNjAzMDUyMzAxNDBaMDMxMTAvBgNVBAMTKENhZGR5
-IExvY2FsIEF1dGhvcml0eSAtIEVDQyBJbnRlcm1lZGlhdGUwWTATBgcqhkjOPQIB
-BggqhkjOPQMBBwNCAASDLqAOiwMVYPDiJkVAgXMyakfgRRNmS++JHCAnwyRGJZQB
-HE+r9u+fTYpw9BK0bkRipwjNYOA3warkz//wV+0no2YwZDAOBgNVHQ8BAf8EBAMC
-AQYwEgYDVR0TAQH/BAgwBgEB/wIBADAdBgNVHQ4EFgQU7FXW3k808NOH2bSQBOFz
-N3c0C44wHwYDVR0jBBgwFoAUy/si+Tk7JhNzisET3WLqPSsphxMwCgYIKoZIzj0E
-AwIDRwAwRAIgGvVjJu1vY9xyvARzvN+M4isPw+iF1J0DjnM2AwEF0WwCIA0co7Qw
-Wauk2aBVUGQRMlClnHoefk7UMjNrd5UIgzAc
------END CERTIFICATE-----
diff --git a/caddy/certificates/local/localhost/localhost.json b/caddy/certificates/local/localhost/localhost.json
deleted file mode 100644
index 1d369458..00000000
--- a/caddy/certificates/local/localhost/localhost.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-	"sans": [
-		"localhost"
-	],
-	"issuer_data": null
-}
\ No newline at end of file
diff --git a/caddy/certificates/local/localhost/localhost.key b/caddy/certificates/local/localhost/localhost.key
deleted file mode 100644
index eb9bbf73..00000000
--- a/caddy/certificates/local/localhost/localhost.key
+++ /dev/null
@@ -1,5 +0,0 @@
------BEGIN EC PRIVATE KEY-----
-MHcCAQEEIBZ4VOeTB50wBbX6VxwZSDg8D1kofdc7ngBhv1//HU4OoAoGCCqGSM49
-AwEHoUQDQgAEUetkMwTjx3tkxpt/InqxZfHdgSOTqiufm2ZQu6BZU45zyjXNrTSM
-FkUDe7P5oIxqH0xG4V7SpbDorM1pKaVHBg==
------END EC PRIVATE KEY-----
diff --git a/caddy/instance.uuid b/caddy/instance.uuid
deleted file mode 100644
index 6da4a7b6..00000000
--- a/caddy/instance.uuid
+++ /dev/null
@@ -1 +0,0 @@
-f594da3e-bbca-41b2-b9bd-128bbf68cd17
\ No newline at end of file
diff --git a/caddy/last_clean.json b/caddy/last_clean.json
deleted file mode 100644
index d16a09cc..00000000
--- a/caddy/last_clean.json
+++ /dev/null
@@ -1 +0,0 @@
-{"tls":{"timestamp":"2026-02-26T23:01:40.136471421Z","instance_id":"f594da3e-bbca-41b2-b9bd-128bbf68cd17"}}
\ No newline at end of file
diff --git a/caddy/pki/authorities/local/intermediate.crt b/caddy/pki/authorities/local/intermediate.crt
deleted file mode 100644
index 2d916f49..00000000
--- a/caddy/pki/authorities/local/intermediate.crt
+++ /dev/null
@@ -1,12 +0,0 @@
------BEGIN CERTIFICATE-----
-MIIBxzCCAW6gAwIBAgIRAI0iQ73L7bHafZWUPizI2TQwCgYIKoZIzj0EAwIwMDEu
-MCwGA1UEAxMlQ2FkZHkgTG9jYWwgQXV0aG9yaXR5IC0gMjAyNiBFQ0MgUm9vdDAe
-Fw0yNjAyMjYyMzAxNDBaFw0yNjAzMDUyMzAxNDBaMDMxMTAvBgNVBAMTKENhZGR5
-IExvY2FsIEF1dGhvcml0eSAtIEVDQyBJbnRlcm1lZGlhdGUwWTATBgcqhkjOPQIB
-BggqhkjOPQMBBwNCAASDLqAOiwMVYPDiJkVAgXMyakfgRRNmS++JHCAnwyRGJZQB
-HE+r9u+fTYpw9BK0bkRipwjNYOA3warkz//wV+0no2YwZDAOBgNVHQ8BAf8EBAMC
-AQYwEgYDVR0TAQH/BAgwBgEB/wIBADAdBgNVHQ4EFgQU7FXW3k808NOH2bSQBOFz
-N3c0C44wHwYDVR0jBBgwFoAUy/si+Tk7JhNzisET3WLqPSsphxMwCgYIKoZIzj0E
-AwIDRwAwRAIgGvVjJu1vY9xyvARzvN+M4isPw+iF1J0DjnM2AwEF0WwCIA0co7Qw
-Wauk2aBVUGQRMlClnHoefk7UMjNrd5UIgzAc
------END CERTIFICATE-----
diff --git a/caddy/pki/authorities/local/intermediate.key b/caddy/pki/authorities/local/intermediate.key
deleted file mode 100644
index 0e84ef23..00000000
--- a/caddy/pki/authorities/local/intermediate.key
+++ /dev/null
@@ -1,5 +0,0 @@
------BEGIN EC PRIVATE KEY-----
-MHcCAQEEIB9DxSOKSetJaWW8o3231uOiZT2DE+LcjkjGIL32HtuRoAoGCCqGSM49
-AwEHoUQDQgAEgy6gDosDFWDw4iZFQIFzMmpH4EUTZkvviRwgJ8MkRiWUARxPq/bv
-n02KcPQStG5EYqcIzWDgN8Gq5M//8FftJw==
------END EC PRIVATE KEY-----
diff --git a/caddy/pki/authorities/local/root.crt b/caddy/pki/authorities/local/root.crt
deleted file mode 100644
index 1852c57e..00000000
--- a/caddy/pki/authorities/local/root.crt
+++ /dev/null
@@ -1,11 +0,0 @@
------BEGIN CERTIFICATE-----
-MIIBozCCAUmgAwIBAgIQT/JWDCE3qmAv/G4kL62XwDAKBggqhkjOPQQDAjAwMS4w
-LAYDVQQDEyVDYWRkeSBMb2NhbCBBdXRob3JpdHkgLSAyMDI2IEVDQyBSb290MB4X
-DTI2MDIyNjIzMDE0MFoXDTM2MDEwNTIzMDE0MFowMDEuMCwGA1UEAxMlQ2FkZHkg
-TG9jYWwgQXV0aG9yaXR5IC0gMjAyNiBFQ0MgUm9vdDBZMBMGByqGSM49AgEGCCqG
-SM49AwEHA0IABBuUFHMmsY5tGwU9VAi2QYWXRi/c17CHS1IwiDrOrHIY4cHIJ9X9
-rd8GTCZisBIc0zTLDXYoeyxylwDZmjI959KjRTBDMA4GA1UdDwEB/wQEAwIBBjAS
-BgNVHRMBAf8ECDAGAQH/AgEBMB0GA1UdDgQWBBTL+yL5OTsmE3OKwRPdYuo9KymH
-EzAKBggqhkjOPQQDAgNIADBFAiEA5/u8ltgiRTbCHnBT3zGw9AiwWRSo5Z7Jf5iT
-KIr/ADcCIBqZrqLoesHWg/XH1zpzhsfnSAP+pMBhac1ENM3C9ukv
------END CERTIFICATE-----
diff --git a/caddy/pki/authorities/local/root.key b/caddy/pki/authorities/local/root.key
deleted file mode 100644
index d287b937..00000000
--- a/caddy/pki/authorities/local/root.key
+++ /dev/null
@@ -1,5 +0,0 @@
------BEGIN EC PRIVATE KEY-----
-MHcCAQEEIJxI7xzy5gYgTvbDcCKlb/izJ+GuT6nSj5+xjoaQabuJoAoGCCqGSM49
-AwEHoUQDQgAEG5QUcyaxjm0bBT1UCLZBhZdGL9zXsIdLUjCIOs6schjhwcgn1f2t
-3wZMJmKwEhzTNMsNdih7LHKXANmaMj3n0g==
------END EC PRIVATE KEY-----
diff --git a/config/application.rb b/config/application.rb
index a2bcddaf..16f48ff4 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -19,6 +19,19 @@ module DocuSeal
   class Application < Rails::Application
     config.load_defaults 8.1
 
+    # Rails 8.x / Ruby 4.0 compatibility: several ActiveRecord class attributes
+    # that were formerly configurable were permanently hardcoded and their setter
+    # methods removed from ActiveRecord::Base.  load_defaults 8.1 still adds them
+    # to the config.active_record hash (via cumulative 5.x-7.x defaults), and the
+    # AR railtie's set_configs initializer blindly calls the setter for every key,
+    # raising NoMethodError.  Deleting the keys here prevents the setters from
+    # being called.
+    %i[
+      belongs_to_required_by_default
+      has_many_inversing
+      run_commit_callbacks_on_first_saved_instances_in_transaction
+    ].each { |key| config.active_record.delete(key) }
+
     config.autoload_lib(ignore: %w[assets tasks puma])
 
     config.active_storage.routes_prefix = ''
diff --git a/docker-compose.yml b/docker-compose.yml
index ca4e04ef..33acc5c3 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,8 +1,5 @@
 services:
   app:
-    depends_on:
-      postgres:
-        condition: service_healthy
     build: .
     image: intebec/docuseal:latest
     ports:
@@ -11,21 +8,6 @@ services:
       - ./docuseal:/data/docuseal
     environment:
       - FORCE_SSL=${HOST}
-      - DATABASE_URL=postgresql://postgres:postgres@postgres:5432/docuseal
-
-  postgres:
-    image: postgres:18
-    volumes:
-      - "./pg_data:/var/lib/postgresql/18/docker"
-    environment:
-      POSTGRES_USER: postgres
-      POSTGRES_PASSWORD: postgres
-      POSTGRES_DB: docuseal
-    healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U postgres"]
-      interval: 5s
-      timeout: 5s
-      retries: 5
 
   caddy:
     image: caddy:latest