diff --git a/src/invidious/database/sessions.cr b/src/invidious/database/sessions.cr
index 96587082..ca083d38 100644
--- a/src/invidious/database/sessions.cr
+++ b/src/invidious/database/sessions.cr
@@ -7,7 +7,7 @@ module Invidious::Database::SessionIDs
   #  Insert
   # -------------------
 
-  def insert(sid : String, email : String, handle_conflicts : Bool = false)
+  def insert(sid : String, email : String, handle_conflicts : Bool = false, *, conn : DB::Database | DB::Connection | DB::Transaction = PG_DB)
     request = <<-SQL
       INSERT INTO session_ids
       VALUES ($1, $2, now())
@@ -15,38 +15,38 @@ module Invidious::Database::SessionIDs
 
     request += " ON CONFLICT (id) DO NOTHING" if handle_conflicts
 
-    PG_DB.exec(request, sid, email)
+    conn.exec(request, sid, email)
   end
 
   # -------------------
   #  Delete
   # -------------------
 
-  def delete(*, sid : String)
+  def delete(*, sid : String, conn : DB::Database | DB::Connection | DB::Transaction = PG_DB)
     request = <<-SQL
       DELETE FROM session_ids *
       WHERE id = $1
     SQL
 
-    PG_DB.exec(request, sid)
+    conn.exec(request, sid)
   end
 
-  def delete(*, email : String)
+  def delete(*, email : String, conn : DB::Database | DB::Connection | DB::Transaction = PG_DB)
     request = <<-SQL
       DELETE FROM session_ids *
       WHERE email = $1
     SQL
 
-    PG_DB.exec(request, email)
+    conn.exec(request, email)
   end
 
-  def delete(*, sid : String, email : String)
+  def delete(*, sid : String, email : String, conn : DB::Database | DB::Connection | DB::Transaction = PG_DB)
     request = <<-SQL
       DELETE FROM session_ids *
       WHERE id = $1 AND email = $2
     SQL
 
-    PG_DB.exec(request, sid, email)
+    conn.exec(request, sid, email)
   end
 
   # -------------------
diff --git a/src/invidious/database/users.cr b/src/invidious/database/users.cr
index 4a3056ea..95edef4b 100644
--- a/src/invidious/database/users.cr
+++ b/src/invidious/database/users.cr
@@ -7,7 +7,7 @@ module Invidious::Database::Users
   #  Insert / delete
   # -------------------
 
-  def insert(user : User, update_on_conflict : Bool = false)
+  def insert(user : User, update_on_conflict : Bool = false, *, conn : DB::Database | DB::Connection | DB::Transaction = PG_DB)
     user_array = user.to_a
     user_array[4] = user_array[4].to_json # User preferences
 
@@ -23,16 +23,16 @@ module Invidious::Database::Users
       SQL
     end
 
-    PG_DB.exec(request, args: user_array)
+    conn.exec(request, args: user_array)
   end
 
-  def delete(user : User)
+  def delete(user : User, *, conn : DB::Database | DB::Connection | DB::Transaction = PG_DB)
     request = <<-SQL
       DELETE FROM users *
       WHERE email = $1
     SQL
 
-    PG_DB.exec(request, user.email)
+    conn.exec(request, user.email)
   end
 
   # -------------------
diff --git a/src/invidious/routes/account.cr b/src/invidious/routes/account.cr
index c8db207c..4cfc5ac9 100644
--- a/src/invidious/routes/account.cr
+++ b/src/invidious/routes/account.cr
@@ -124,9 +124,11 @@ module Invidious::Routes::Account
     end
 
     view_name = "subscriptions_#{sha256(user.email)}"
-    Invidious::Database::Users.delete(user)
-    Invidious::Database::SessionIDs.delete(email: user.email)
-    PG_DB.exec("DROP MATERIALIZED VIEW #{view_name}")
+    PG_DB.transaction do |tx|
+      Invidious::Database::Users.delete(user, conn: tx.connection)
+      Invidious::Database::SessionIDs.delete(email: user.email, conn: tx.connection)
+      tx.connection.exec("DROP MATERIALIZED VIEW #{view_name}")
+    end
 
     env.request.cookies.each do |cookie|
       cookie.expires = Time.utc(1990, 1, 1)
diff --git a/src/invidious/routes/login.cr b/src/invidious/routes/login.cr
index 7d7da487..3a1d13dd 100644
--- a/src/invidious/routes/login.cr
+++ b/src/invidious/routes/login.cr
@@ -122,11 +122,13 @@ module Invidious::Routes::Login
           end
         end
 
-        Invidious::Database::Users.insert(user)
-        Invidious::Database::SessionIDs.insert(sid, email)
+        PG_DB.transaction do |tx|
+          Invidious::Database::Users.insert(user, conn: tx.connection)
+          Invidious::Database::SessionIDs.insert(sid, email, conn: tx.connection)
 
-        view_name = "subscriptions_#{sha256(user.email)}"
-        PG_DB.exec("CREATE MATERIALIZED VIEW #{view_name} AS #{MATERIALIZED_VIEW_SQL.call(user.email)}")
+          view_name = "subscriptions_#{sha256(user.email)}"
+          tx.connection.exec("CREATE MATERIALIZED VIEW #{view_name} AS #{MATERIALIZED_VIEW_SQL.call(user.email)}")
+        end
 
         if alt = CONFIG.alternative_domains.index(host)
           env.response.cookies["SID"] = Invidious::User::Cookies.sid(CONFIG.alternative_domains[alt], sid)