diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a58a6db68f..b92d34bec2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -55,7 +55,7 @@ jobs:
     steps:
       - name: Install system packages
         timeout-minutes: 10
-        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y libsqlite3-0 libvips curl ffmpeg
+        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y libmysqlclient-dev libsqlite3-0 libvips curl ffmpeg
 
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
diff --git a/Brewfile b/Brewfile
index ce2b67921c..5f1e5c71fd 100644
--- a/Brewfile
+++ b/Brewfile
@@ -1,4 +1,5 @@
 brew "imagemagick"
+brew "mysql-client"
 brew "openslide"
 brew "vips"
 brew "gitleaks"
diff --git a/Dockerfile b/Dockerfile
index 93460dabe2..1425517d23 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,7 +16,7 @@ WORKDIR /rails
 
 # Install base packages
 RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y ca-certificates curl libjemalloc2 libvips sqlite3 libssl-dev && \
+    apt-get install --no-install-recommends -y ca-certificates curl libjemalloc2 libmariadb3 libvips sqlite3 libssl-dev && \
     ln -s /usr/lib/$(uname -m)-linux-gnu/libjemalloc.so.2 /usr/local/lib/libjemalloc.so && \
     rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
@@ -32,7 +32,7 @@ FROM base AS build
 
 # Install packages needed to build gems
 RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y build-essential git libyaml-dev pkg-config && \
+    apt-get install --no-install-recommends -y build-essential default-libmysqlclient-dev git libyaml-dev pkg-config && \
     rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
 # Install application gems
diff --git a/Gemfile b/Gemfile
index 20989cfd19..10792a8251 100644
--- a/Gemfile
+++ b/Gemfile
@@ -23,7 +23,7 @@ gem "solid_cache", "~> 1.0"
 gem "solid_queue", "~> 1.7"
 gem "sqlite3", ">= 2.0"
 gem "thruster", require: false
-gem "trilogy", "~> 2.13"
+gem "mysql2", "~> 0.5"
 gem "tzinfo-data" # Bundled zone data; the base image's tzdata package lags IANA
 
 # Features
diff --git a/Gemfile.lock b/Gemfile.lock
index 1ba6b2406f..0bd866cdf7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -308,6 +308,8 @@ GEM
     mocha (3.1.0)
       ruby2_keywords (>= 0.0.5)
     msgpack (1.8.5)
+    mysql2 (0.5.7)
+      bigdecimal
     net-http-persistent (4.0.8)
       connection_pool (>= 2.2.4, < 4)
     net-imap (0.6.6)
@@ -323,7 +325,8 @@ GEM
       net-ssh (>= 5.0.0, < 8.0.0)
     net-smtp (0.5.1)
       net-protocol
-    net-ssh (7.3.3)
+    net-ssh (7.3.8)
+      logger
     nio4r (2.7.5)
     nokogiri (1.19.4-aarch64-linux-gnu)
       racc (~> 1.4)
@@ -490,8 +493,6 @@ GEM
     thruster (0.1.26-x86_64-darwin)
     thruster (0.1.26-x86_64-linux)
     timeout (0.6.1)
-    trilogy (2.13.1)
-      bigdecimal
     tsort (0.2.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
@@ -553,6 +554,7 @@ DEPENDENCIES
   mission_control-jobs
   mittens
   mocha
+  mysql2 (~> 0.5)
   net-http-persistent
   platform_agent
   propshaft
@@ -573,7 +575,6 @@ DEPENDENCIES
   stimulus-rails
   surfguard!
   thruster
-  trilogy (~> 2.13)
   turbo-rails!
   tzinfo-data
   useragent!
@@ -680,6 +681,7 @@ CHECKSUMS
   mittens (0.3.4) sha256=baa8e35c24bc06d6ed5c51633c800e8b6108ebcbd8efb1782d7146923797b383
   mocha (3.1.0) sha256=75f42d69ebfb1f10b32489dff8f8431d37a418120ecdfc07afe3bc183d4e1d56
   msgpack (1.8.5) sha256=97419eaa7b35dfe3e462c0e6c1a3dfdcbfc8756605c09e46e4c6daef127517ba
+  mysql2 (0.5.7) sha256=ba09ede515a0ae8a7192040a1b778c0fb0f025fa5877e9be895cd325fa5e9d7b
   net-http-persistent (4.0.8) sha256=ef3de8319d691537b329053fae3a33195f8b070bbbfae8bf1a58c796081960e6
   net-imap (0.6.6) sha256=96aa4ee50df3060203e649efc341f53480b791d49e150f2fdebf68beb141a8df
   net-pop (0.1.2) sha256=848b4e982013c15b2f0382792268763b748cce91c9e91e36b0f27ed26420dff3
@@ -687,7 +689,7 @@ CHECKSUMS
   net-scp (4.1.0) sha256=a99b0b92a1e5d360b0de4ffbf2dc0c91531502d3d4f56c28b0139a7c093d1a5d
   net-sftp (4.0.0) sha256=65bb91c859c2f93b09826757af11b69af931a3a9155050f50d1b06d384526364
   net-smtp (0.5.1) sha256=ed96a0af63c524fceb4b29b0d352195c30d82dd916a42f03c62a3a70e5b70736
-  net-ssh (7.3.3) sha256=831def58b2c51dcef66ec00d29397d4f210de89c19fe78f95873ca30f386e86a
+  net-ssh (7.3.8) sha256=16bb1fccc4d9a580decdeea8ddb98e8544df29b7e6ac8cb94d4b379cfe4bee9f
   nio4r (2.7.5) sha256=6c90168e48fb5f8e768419c93abb94ba2b892a1d0602cb06eef16d8b7df1dca1
   nokogiri (1.19.4-aarch64-linux-gnu) sha256=1269fb644a6de405057a53dd5c762b1209b43ca7424f839454d3dbc677c31a8f
   nokogiri (1.19.4-aarch64-linux-musl) sha256=35c65b9ce72b3bb03207bdbe7067915019dc18c1b9b59139684bd6690fdd01af
@@ -767,7 +769,6 @@ CHECKSUMS
   thruster (0.1.26-x86_64-darwin) sha256=c7f7f0cbefd8030ea03bf88f6a988f595a0618a35a1a0d358e729c6898eb5b6a
   thruster (0.1.26-x86_64-linux) sha256=3117a6ee430663f845a0457699fe9a05232dcc6c396e2cc83504de5a223c60e8
   timeout (0.6.1) sha256=78f57368a7e7bbadec56971f78a3f5ecbcfb59b7fcbb0a3ed6ddc08a5094accb
-  trilogy (2.13.1) sha256=fbfb17c439b347e4240be70b80facf0f6f9c417b34c528179ff065b3d53635c9
   tsort (0.2.0) sha256=9650a793f6859a43b6641671278f79cfead60ac714148aabe4e3f0060480089f
   turbo-rails (2.0.23)
   tzinfo (2.0.6) sha256=8daf828cc77bcf7d63b0e3bdb6caa47e2272dcfaf4fbfe46f8c3a9df087a829b
diff --git a/Gemfile.saas.lock b/Gemfile.saas.lock
index 796a4afacd..f55a9c74d8 100644
--- a/Gemfile.saas.lock
+++ b/Gemfile.saas.lock
@@ -428,6 +428,8 @@ GEM
       ruby2_keywords (>= 0.0.5)
     msgpack (1.8.5)
     multi_json (1.19.1)
+    mysql2 (0.5.7)
+      bigdecimal
     net-http (0.9.1)
       uri (>= 0.11.1)
     net-http-persistent (4.0.8)
@@ -445,7 +447,8 @@ GEM
       net-ssh (>= 5.0.0, < 8.0.0)
     net-smtp (0.5.1)
       net-protocol
-    net-ssh (7.3.3)
+    net-ssh (7.3.8)
+      logger
     nio4r (2.7.5)
     nokogiri (1.19.4-aarch64-linux-gnu)
       racc (~> 1.4)
@@ -668,8 +671,6 @@ GEM
     thruster (0.1.26-x86_64-darwin)
     thruster (0.1.26-x86_64-linux)
     timeout (0.6.1)
-    trilogy (2.13.1)
-      bigdecimal
     tsort (0.2.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
@@ -771,6 +772,7 @@ DEPENDENCIES
   mission_control-jobs
   mittens
   mocha
+  mysql2 (~> 0.5)
   net-http-persistent
   platform_agent
   prometheus-client-mmap (~> 1.3)
@@ -796,7 +798,6 @@ DEPENDENCIES
   stimulus-rails
   surfguard!
   thruster
-  trilogy (~> 2.13)
   turbo-rails!
   tzinfo-data
   useragent!
@@ -934,6 +935,7 @@ CHECKSUMS
   mocha (3.1.0) sha256=75f42d69ebfb1f10b32489dff8f8431d37a418120ecdfc07afe3bc183d4e1d56
   msgpack (1.8.5) sha256=97419eaa7b35dfe3e462c0e6c1a3dfdcbfc8756605c09e46e4c6daef127517ba
   multi_json (1.19.1) sha256=7aefeff8f2c854bf739931a238e4aea64592845e0c0395c8a7d2eea7fdd631b7
+  mysql2 (0.5.7) sha256=ba09ede515a0ae8a7192040a1b778c0fb0f025fa5877e9be895cd325fa5e9d7b
   net-http (0.9.1) sha256=25ba0b67c63e89df626ed8fac771d0ad24ad151a858af2cc8e6a716ca4336996
   net-http-persistent (4.0.8) sha256=ef3de8319d691537b329053fae3a33195f8b070bbbfae8bf1a58c796081960e6
   net-imap (0.6.6) sha256=96aa4ee50df3060203e649efc341f53480b791d49e150f2fdebf68beb141a8df
@@ -942,7 +944,7 @@ CHECKSUMS
   net-scp (4.1.0) sha256=a99b0b92a1e5d360b0de4ffbf2dc0c91531502d3d4f56c28b0139a7c093d1a5d
   net-sftp (4.0.0) sha256=65bb91c859c2f93b09826757af11b69af931a3a9155050f50d1b06d384526364
   net-smtp (0.5.1) sha256=ed96a0af63c524fceb4b29b0d352195c30d82dd916a42f03c62a3a70e5b70736
-  net-ssh (7.3.3) sha256=831def58b2c51dcef66ec00d29397d4f210de89c19fe78f95873ca30f386e86a
+  net-ssh (7.3.8) sha256=16bb1fccc4d9a580decdeea8ddb98e8544df29b7e6ac8cb94d4b379cfe4bee9f
   nio4r (2.7.5) sha256=6c90168e48fb5f8e768419c93abb94ba2b892a1d0602cb06eef16d8b7df1dca1
   nokogiri (1.19.4-aarch64-linux-gnu) sha256=1269fb644a6de405057a53dd5c762b1209b43ca7424f839454d3dbc677c31a8f
   nokogiri (1.19.4-aarch64-linux-musl) sha256=35c65b9ce72b3bb03207bdbe7067915019dc18c1b9b59139684bd6690fdd01af
@@ -1040,7 +1042,6 @@ CHECKSUMS
   thruster (0.1.26-x86_64-darwin) sha256=c7f7f0cbefd8030ea03bf88f6a988f595a0618a35a1a0d358e729c6898eb5b6a
   thruster (0.1.26-x86_64-linux) sha256=3117a6ee430663f845a0457699fe9a05232dcc6c396e2cc83504de5a223c60e8
   timeout (0.6.1) sha256=78f57368a7e7bbadec56971f78a3f5ecbcfb59b7fcbb0a3ed6ddc08a5094accb
-  trilogy (2.13.1) sha256=fbfb17c439b347e4240be70b80facf0f6f9c417b34c528179ff065b3d53635c9
   tsort (0.2.0) sha256=9650a793f6859a43b6641671278f79cfead60ac714148aabe4e3f0060480089f
   turbo-rails (2.0.23)
   tzinfo (2.0.6) sha256=8daf828cc77bcf7d63b0e3bdb6caa47e2272dcfaf4fbfe46f8c3a9df087a829b
diff --git a/app/models/board/accessible.rb b/app/models/board/accessible.rb
index 984e9ec94a..3000510279 100644
--- a/app/models/board/accessible.rb
+++ b/app/models/board/accessible.rb
@@ -85,7 +85,7 @@ def notifications_for_user(user)
       #
       # Notification->Event->Mention->Card and Notification->Event->Mention->Comment->Card are
       # handled by destroying mentions_for_user.
-      uuid_type = ActiveRecord::Type.lookup(:uuid, adapter: :trilogy)
+      uuid_type = ActiveRecord::Type.lookup(:uuid, adapter: :mysql2)
       board_id_binary = uuid_type.serialize(id)
 
       user.notifications
diff --git a/app/models/search/record.rb b/app/models/search/record.rb
index 52ab6cd80f..124778107d 100644
--- a/app/models/search/record.rb
+++ b/app/models/search/record.rb
@@ -1,5 +1,5 @@
 class Search::Record < ApplicationRecord
-  if connection.adapter_name == "Trilogy"
+  if connection.adapter_name == "Mysql2"
     self.abstract_class = true  # MySQL uses sharded tables; shard models set their own table_name
   else
     self.table_name = "search_records"
diff --git a/config/database.mysql.yml b/config/database.mysql.yml
index 2f72f6e989..a42f15a815 100644
--- a/config/database.mysql.yml
+++ b/config/database.mysql.yml
@@ -1,5 +1,5 @@
 default: &default
-  adapter: trilogy
+  adapter: mysql2
   host: <%= ENV.fetch("MYSQL_HOST", "127.0.0.1") %>
   port: <%= ENV.fetch("MYSQL_PORT", "3306") %>
   username: <%= ENV.fetch("MYSQL_USER", "root") %>
diff --git a/config/initializers/mysql_ssl_mode.rb b/config/initializers/mysql_ssl_mode.rb
new file mode 100644
index 0000000000..1d7f470b12
--- /dev/null
+++ b/config/initializers/mysql_ssl_mode.rb
@@ -0,0 +1,5 @@
+# mysql2 built against MariaDB Connector/C, as in the Docker image, ignores verify_ca and
+# connects without checking the server certificate.
+if ENV["MYSQL_SSL_MODE"].to_s.casecmp?("verify_ca")
+  raise "MYSQL_SSL_MODE=verify_ca is not supported. Use verify_identity, which checks the server certificate and its host name."
+end
diff --git a/config/initializers/uuid_primary_keys.rb b/config/initializers/uuid_primary_keys.rb
index 4b4bc8fdf7..7131d9c56d 100644
--- a/config/initializers/uuid_primary_keys.rb
+++ b/config/initializers/uuid_primary_keys.rb
@@ -35,7 +35,7 @@ module MysqlUuidAdapter
   # Override lookup_cast_type to recognize binary(16) as UUID type
   def lookup_cast_type(sql_type)
     if sql_type == "binary(16)"
-      ActiveRecord::Type.lookup(:uuid, adapter: :trilogy)
+      ActiveRecord::Type.lookup(:uuid, adapter: :mysql2)
     else
       super
     end
@@ -116,7 +116,7 @@ def uuid(name, **options)
   ActiveRecord::ConnectionAdapters::TableDefinition.prepend(TableDefinitionUuidSupport)
 end
 
-ActiveSupport.on_load(:active_record_trilogyadapter) do
+ActiveSupport.on_load(:active_record_mysql2adapter) do
   ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter.prepend(MysqlUuidAdapter)
   ActiveRecord::ConnectionAdapters::MySQL::SchemaDumper.prepend(SchemaDumperUuidType)
 end
diff --git a/lib/rails_ext/active_record_sql_redaction.rb b/lib/rails_ext/active_record_sql_redaction.rb
index 74d2d01be2..06d21cdd70 100644
--- a/lib/rails_ext/active_record_sql_redaction.rb
+++ b/lib/rails_ext/active_record_sql_redaction.rb
@@ -1,4 +1,4 @@
-# Trilogy runs without prepared statements, so a value reaches the SQL text as a quoted literal. The
+# MySQL runs without prepared statements, so a value reaches the SQL text as a quoted literal. The
 # sql.active_record notification carries that text to every consumer, and with Rails.event in debug mode
 # (config/application.rb) it reaches the log: in SaaS mode, the structured log line for the request or
 # job, and from there Loki. Sentry breadcrumbs and spans read it too, and a database error can quote a
@@ -72,7 +72,7 @@ def mentions_redacted_table?(text)
     def filter_error(error)
       filtered = \
         if server_error_code(error)
-          [ error.error_code, FILTERED_ERROR ].join(": ")
+          [ error.error_number, FILTERED_ERROR ].join(": ")
         else
           redact_error_message(error.message)
         end
@@ -89,7 +89,7 @@ def redact_error_message(message)
 
     private
       def server_error_code(error)
-        error.respond_to?(:error_code) && error.error_code
+        error.respond_to?(:error_number) && error.error_number
       end
 
       def reference_to(table)
@@ -123,7 +123,7 @@ module ActiveRecordSqlRedaction::ErrorTranslation
   private
     def translate_exception_class(native_error, sql, binds)
       if ActiveRecordSqlRedaction.redacted_statement?(sql) && \
-          ActiveRecordSqlRedaction::UNFILTERED_ERROR_CODES.exclude?(native_error.try(:error_code))
+          ActiveRecordSqlRedaction::UNFILTERED_ERROR_CODES.exclude?(native_error.try(:error_number))
         ActiveRecordSqlRedaction.filter_error(native_error)
       end
 
diff --git a/lib/rails_ext/active_record_trilogy_quote_string.rb b/lib/rails_ext/active_record_trilogy_quote_string.rb
deleted file mode 100644
index 9447fae7a5..0000000000
--- a/lib/rails_ext/active_record_trilogy_quote_string.rb
+++ /dev/null
@@ -1,14 +0,0 @@
-# Match mysql2 behavior
-module ActiveRecordTrilogyQuoteString
-  def quote_string(string)
-    unless string.encoding == Encoding::UTF_8 || string.encoding == Encoding::BINARY || @config[:encoding] == "binary"
-      string = string.encode(Encoding::UTF_8)
-    end
-
-    super
-  end
-end
-
-ActiveSupport.on_load :active_record_trilogyadapter do
-  prepend ActiveRecordTrilogyQuoteString
-end
diff --git a/lib/rails_ext/active_record_uuid_type.rb b/lib/rails_ext/active_record_uuid_type.rb
index f2004f2493..e3357505af 100644
--- a/lib/rails_ext/active_record_uuid_type.rb
+++ b/lib/rails_ext/active_record_uuid_type.rb
@@ -41,6 +41,6 @@ def cast(value)
   end
 end
 
-# Register the UUID type for Trilogy (MySQL) and SQLite3 adapters
-ActiveRecord::Type.register(:uuid, ActiveRecord::Type::Uuid, adapter: :trilogy)
+# Register the UUID type for the Mysql2 and SQLite3 adapters
+ActiveRecord::Type.register(:uuid, ActiveRecord::Type::Uuid, adapter: :mysql2)
 ActiveRecord::Type.register(:uuid, ActiveRecord::Type::Uuid, adapter: :sqlite3)
diff --git a/saas/Dockerfile b/saas/Dockerfile
index 9f6e75e13b..9dc962f7b8 100644
--- a/saas/Dockerfile
+++ b/saas/Dockerfile
@@ -25,7 +25,7 @@ FROM base AS build
 
 # Install packages needed to build gems
 RUN apt-get update -qq && \
-    apt-get install -y --no-install-recommends -y build-essential pkg-config git libvips libyaml-dev libssl-dev && \
+    apt-get install -y --no-install-recommends -y build-essential default-libmysqlclient-dev pkg-config git libvips libyaml-dev libssl-dev && \
     rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
 # Install application gems
@@ -63,7 +63,7 @@ FROM base
 # library (ActiveStorage::VIPS_AVAILABLE=false), and config/initializers/vips.rb only demands it
 # when no cell is registered.
 RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y libsqlite3-0 sqlite3 libjemalloc-dev && \
+    apt-get install --no-install-recommends -y libmariadb3 libsqlite3-0 sqlite3 libjemalloc-dev && \
     rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
 # The eMudhra intermediate CAs' private keys leaked in October 2026, and they chain to these two roots.
diff --git a/saas/config/database.yml b/saas/config/database.yml
index eff904609b..51f918d587 100644
--- a/saas/config/database.yml
+++ b/saas/config/database.yml
@@ -33,9 +33,10 @@
 %>
 
 default: &default
-  adapter: trilogy
+  adapter: mysql2
   host: <%= ENV.fetch "FIZZY_DB_HOST", "127.0.0.1" %>
   port: <%= ENV.fetch "FIZZY_DB_PORT", 3306 %>
+  username: root # mysql2 falls back to the OS user; production names its own
   pool: 50
   timeout: 5000
   <% unless ENV["MIGRATE"].present? %>
diff --git a/saas/test/integration/structured_log_redaction_test.rb b/saas/test/integration/structured_log_redaction_test.rb
index 3e7f492f9d..998b5e5891 100644
--- a/saas/test/integration/structured_log_redaction_test.rb
+++ b/saas/test/integration/structured_log_redaction_test.rb
@@ -118,7 +118,7 @@ def perform(identity)
       ActiveRecord::Base.cache { 2.times { assert MagicLink.find_by(code: CODE) } }
       assert_raises(ActiveRecord::RecordNotUnique) { identities(:kevin).magic_links.new(code: CODE, expires_at: 1.minute.from_now).save!(validate: false) }
       transaction.finish
-      Sentry.capture_exception(ActiveRecord::RecordNotUnique.new("Trilogy::ProtocolError: 1062: Duplicate entry '#{CODE}' for key 'magic_links.index_magic_links_on_code'"))
+      Sentry.capture_exception(ActiveRecord::RecordNotUnique.new("Mysql2::Error: Duplicate entry '#{CODE}' for key 'magic_links.index_magic_links_on_code'"))
 
       assert sentry_events.many?
       assert_no_secret CODE, sentry_events.map { |event| event.to_h.to_json }
@@ -139,7 +139,7 @@ def perform(identity)
     unclosed = Sentry::Breadcrumb.new(category: "sql.active_record", data: { sql: "SELECT * FROM magic_links WHERE purpose = '0' AND code = '#{CODE}" })
     assert_no_secret CODE, [ config.before_breadcrumb.call(unclosed, {}).data[:sql] ]
 
-    error = ActiveRecord::RecordNotUnique.new("Trilogy::ProtocolError: 1062: Duplicate entry '#{CODE}' for key 'magic_links.index_magic_links_on_code'")
+    error = ActiveRecord::RecordNotUnique.new("Mysql2::Error: Duplicate entry '#{CODE}' for key 'magic_links.index_magic_links_on_code'")
     event = Sentry::ErrorEvent.new(configuration: config).tap { |event| event.add_exception_interface(error, mechanism: Sentry::Mechanism.new) }
     assert_no_secret CODE, [ config.before_send.call(event, {}).exception.values.map(&:value).inspect ]
 
diff --git a/test/initializers/mysql_ssl_mode_test.rb b/test/initializers/mysql_ssl_mode_test.rb
new file mode 100644
index 0000000000..5b5be80992
--- /dev/null
+++ b/test/initializers/mysql_ssl_mode_test.rb
@@ -0,0 +1,31 @@
+require "test_helper"
+
+class MysqlSslModeTest < ActiveSupport::TestCase
+  test "verify_ca is refused" do
+    %w[ verify_ca VERIFY_CA ].each do |mode|
+      with_mysql_ssl_mode(mode) do
+        error = assert_raises(RuntimeError) { load_initializer }
+        assert_match "verify_identity", error.message
+      end
+    end
+  end
+
+  test "other modes are allowed" do
+    [ nil, "disabled", "required", "verify_identity" ].each do |mode|
+      with_mysql_ssl_mode(mode) { assert_nothing_raised { load_initializer } }
+    end
+  end
+
+  private
+    def with_mysql_ssl_mode(mode)
+      original = ENV["MYSQL_SSL_MODE"]
+      ENV["MYSQL_SSL_MODE"] = mode
+      yield
+    ensure
+      ENV["MYSQL_SSL_MODE"] = original
+    end
+
+    def load_initializer
+      load Rails.root.join("config/initializers/mysql_ssl_mode.rb").to_s
+    end
+end
diff --git a/test/lib/database_adapter_test.rb b/test/lib/database_adapter_test.rb
new file mode 100644
index 0000000000..e3aa2ccf61
--- /dev/null
+++ b/test/lib/database_adapter_test.rb
@@ -0,0 +1,23 @@
+require "test_helper"
+
+class DatabaseAdapterTest < ActiveSupport::TestCase
+  unless Fizzy.db_adapter.sqlite?
+    test "MySQL connects with mysql2" do
+      assert_equal "Mysql2", connection.adapter_name
+    end
+
+    test "MySQL connects in utf8mb4" do
+      assert_equal "utf8mb4", connection.select_value("SELECT @@character_set_connection")
+      assert_equal "🗂️", connection.select_value("SELECT #{connection.quote("🗂️")}")
+    end
+
+    test "MySQL reads binary(16) columns as UUIDs" do
+      assert_equal :uuid, Card.columns_hash["id"].type
+    end
+  end
+
+  private
+    def connection
+      ActiveRecord::Base.connection
+    end
+end
diff --git a/test/lib/rails_ext/active_record_sql_redaction_test.rb b/test/lib/rails_ext/active_record_sql_redaction_test.rb
index 8ca4c5692e..e95b9cd02a 100644
--- a/test/lib/rails_ext/active_record_sql_redaction_test.rb
+++ b/test/lib/rails_ext/active_record_sql_redaction_test.rb
@@ -175,6 +175,18 @@ class ActiveRecordSqlRedactionTest < ActiveSupport::TestCase
     assert_no_secret CODE, seen.join("\n")
   end
 
+  unless Fizzy.db_adapter.sqlite?
+    test "a MySQL server error keeps only its code" do
+      identities(:kevin).magic_links.create!(code: CODE)
+
+      error = assert_raises ActiveRecord::RecordNotUnique do
+        identities(:kevin).magic_links.new(code: CODE, expires_at: 1.minute.from_now).save!(validate: false)
+      end
+
+      assert_equal "1062: #{ActiveRecordSqlRedaction::FILTERED_ERROR}", error.cause.message
+    end
+  end
+
   test "an invalid statement's error, which can quote the statement, carries no value" do
     error = assert_raises ActiveRecord::StatementInvalid do
       MagicLink.connection.select_all("SELECT * FROM magic_links WHERE code = '#{CODE}' INVALID")