diff --git a/.github/workflows/check_pr_title.yml b/.github/workflows/check_pr_title.yml
deleted file mode 100644
index 9b03123..0000000
--- a/.github/workflows/check_pr_title.yml
+++ /dev/null
@@ -1,34 +0,0 @@
-# DON'T MODIFY THIS WORKFLOW FILE DIRECTLY
-#
-# This workflow
-# - checks if the PR title is compliant
-# (cf. https://doctolib.atlassian.net/wiki/spaces/EE/pages/1793131314/How+to+have+a+good+PR+title)
-# - is force implemented in specific repositories (tier0 repository) of the organization with Terraform
-# - is mandatory to merge in main branch of your repo because of
-# https://github.com/doctolib/kube/blob/master/envs/tooling/terraform/05_github/main_rulesets.tf#L1
-#
-# For more details, read https://doctolib.atlassian.net/wiki/spaces/EE/pages/1793590015/Traceability+and+risk+assessment+for+production+changes
-
-name: '[Org workflow] Check PR title'
-run-name: '${{ github.event.pull_request.title }}'
-
-on:
-  pull_request:
-    branches: [master, main, staging]
-    types: [opened, edited, reopened, synchronize, ready_for_review]
-  merge_group:
-
-permissions:
-  pull-requests: write
-  statuses: write
-  repository-projects: read
-  actions: read
-
-jobs:
-  check_pr_title:
-    name: Check PR title
-    if: '!github.event.pull_request.draft'
-    runs-on: ubuntu-latest
-    steps:
-      - name: Check PR title
-        uses: doctolib/actions/check-pr-title@main
diff --git a/src/database.rs b/src/database.rs
index 7ad40e1..634f04f 100644
--- a/src/database.rs
+++ b/src/database.rs
@@ -482,6 +482,19 @@ impl Database {
         })
     }
 
+    pub fn default_collection_or_error(&self) -> Result<Collection> {
+        let mut error = CBLError::default();
+        let collection = unsafe { CBLDatabase_DefaultCollection(self.get_ref(), &mut error) };
+
+        check_error(&error)?;
+
+        if collection.is_null() {
+            Err(Error::cbl_error(CouchbaseLiteError::NotFound))
+        } else {
+            Ok(Collection::retain(collection))
+        }
+    }
+
     //////// NOTIFICATIONS:
 
     /** Registers a database change listener function. It will be called after one or more
diff --git a/src/replicator.rs b/src/replicator.rs
index 19cd64a..61effe0 100644
--- a/src/replicator.rs
+++ b/src/replicator.rs
@@ -641,20 +641,11 @@ pub extern "C" fn c_collection_property_decryptor(
 
 #[derive(Default)]
 pub struct ReplicationConfigurationContext {
-    #[deprecated(note = "please use `collection.push_filter` on default collection instead")]
-    pub push_filter: Option<ReplicationFilter>,
-    #[deprecated(note = "please use `collection.pull_filter` on default collection instead")]
-    pub pull_filter: Option<ReplicationFilter>,
-    #[deprecated(note = "please use `collection.conflict_resolver` on default collection instead")]
-    pub conflict_resolver: Option<ConflictResolver>,
-    #[deprecated(
-        note = "please use `collection_property_encryptor` on default collection instead"
-    )]
-    pub default_collection_property_encryptor: Option<DefaultCollectionPropertyEncryptor>,
-    #[deprecated(
-        note = "please use `collection_property_decryptor` on default collection instead"
-    )]
-    pub default_collection_property_decryptor: Option<DefaultCollectionPropertyDecryptor>,
+    pub push_filter: Option<ReplicationFilter>, // TODO: deprecated
+    pub pull_filter: Option<ReplicationFilter>, // TODO: deprecated
+    pub conflict_resolver: Option<ConflictResolver>, // TODO: deprecated
+    pub default_collection_property_encryptor: Option<DefaultCollectionPropertyEncryptor>, // TODO: deprecated
+    pub default_collection_property_decryptor: Option<DefaultCollectionPropertyDecryptor>, // TODO: deprecated
     pub collection_property_encryptor: Option<CollectionPropertyEncryptor>,
     pub collection_property_decryptor: Option<CollectionPropertyDecryptor>,
 }
@@ -692,11 +683,11 @@ impl ReplicationCollection {
 
 /** The configuration of a replicator. */
 pub struct ReplicatorConfiguration {
-    #[deprecated(note = "use collections instead")]
+    // TODO: deprecated
     pub database: Option<Database>, // The database to replicate. When setting the database, ONLY the default collection will be used for replication.
-    pub endpoint: Endpoint, // The address of the other database to replicate with
+    pub endpoint: Endpoint,         // The address of the other database to replicate with
     pub replicator_type: ReplicatorType, // Push, pull or both
-    pub continuous: bool,   // Continuous replication?
+    pub continuous: bool,           // Continuous replication?
     //-- Auto Purge:
     /**
     If auto purge is active, then the library will automatically purge any documents that the replicating
@@ -721,9 +712,9 @@ pub struct ReplicatorConfiguration {
     pub pinned_server_certificate: Option<Vec<u8>>, // An X.509 cert to "pin" TLS connections to (PEM or DER)
     pub trusted_root_certificates: Option<Vec<u8>>, // Set of anchor certs (PEM format)
     //-- Filtering:
-    #[deprecated(note = "please use `collection.channels` on default collection instead")]
+    // TODO: deprecated
     pub channels: MutableArray, // Optional set of channels to pull from
-    #[deprecated(note = "please use `collection.document_ids` on default collection instead")]
+    // TODO: deprecated
     pub document_ids: MutableArray, // Optional set of document IDs to replicate
     pub collections: Option<Vec<ReplicationCollection>>, // The collections to replicate with the target's endpoint (Required if the database is not set).
     //-- Advanced HTTP settings: