diff --git a/roles/matrix-bridge-mx-puppet-discord/defaults/main.yml b/roles/matrix-bridge-mx-puppet-discord/defaults/main.yml
index 268bbf8f8..5a65f33e9 100644
--- a/roles/matrix-bridge-mx-puppet-discord/defaults/main.yml
+++ b/roles/matrix-bridge-mx-puppet-discord/defaults/main.yml
@@ -55,6 +55,21 @@ matrix_mx_puppet_discord_homeserver_token: ''
 # Can be set to enable automatic double-puppeting via Shared Secret Auth (https://github.com/devture/matrix-synapse-shared-secret-auth).
 matrix_mx_puppet_discord_login_shared_secret: ''
 
+# Database configuration
+matrix_mx_puppet_discord_database_engine: 'sqlite'
+matrix_mx_puppet_discord_database_username: matrix_mx_puppet_discord
+matrix_mx_puppet_discord_database_password: ~
+matrix_mx_puppet_discord_database_hostname: 'matrix-postgres'
+matrix_mx_puppet_discord_database_port: 5432
+matrix_mx_puppet_discord_database_name: matrix_mx_puppet_discord
+matrix_mx_puppet_discord_database_file: /data/database.db
+matrix_mx_puppet_discord_database_connString: >-2
+  {%- if matrix_mx_puppet_discord_database_engine == 'postgres' -%}
+  postgresql://{{ matrix_mx_puppet_discord_database_username }}:{{ matrix_mx_puppet_discord_database_password }}@{{ matrix_mx_puppet_discord_database_hostname }}:{{ matrix_mx_puppet_discord_database_port }}/{{ matrix_mx_puppet_discord_database_name }}?sslmode=disable
+  {%- else if matrix_mx_puppet_discord_database_engine == 'sqlite' -%}
+  {{ matrix_mx_puppet_discord_database_engine }}://{{ matrix_mx_puppet_discord_database_file }}
+  {%- endif -%}
+
 # Default configuration template which covers the generic use case.
 # You can customize it by controlling the various variables inside it.
 #
diff --git a/roles/matrix-bridge-mx-puppet-discord/tasks/validate_config.yml b/roles/matrix-bridge-mx-puppet-discord/tasks/validate_config.yml
index c253eda29..8db47ed1f 100644
--- a/roles/matrix-bridge-mx-puppet-discord/tasks/validate_config.yml
+++ b/roles/matrix-bridge-mx-puppet-discord/tasks/validate_config.yml
@@ -8,3 +8,23 @@
   with_items:
     - "matrix_mx_puppet_discord_appservice_token"
     - "matrix_mx_puppet_discord_homeserver_token"
+
+- block:
+  - name: Check if a SQLite database already exists
+    stat:
+      path: "{{ matrix_mx_puppet_discord_data_path }}/database.db"
+    register: matrix_mx_puppet_discord_sqlite_database_path_local_stat_result
+
+  - name: Fail if an SQLite database already exists when using Postgres
+    fail:
+      msg: >-2
+        matrix_mx_puppet_discord_database_engine has been set to `postgres` (which is our new default now).
+        However, we've discovered an existing SQLite database in {{ matrix_mx_puppet_discord_data_path }}/database.db.
+        It appears that you've been using this bridge with the SQLite engine until now.
+        To continue using SQLite, opt into it explicitly: add `matrix_mx_puppet_discord_database_engine: sqlite` to your vars.yml file and re-run this same command.
+        Alternatively, to migrate your existing SQLite database to Postgres:
+        1. Stop all services (`ansible-playbook -i inventory/hosts setup.yml --tags=stop`)
+        2. Import the SQLite database into Postgres (`ansible-playbook -v -i inventory/hosts setup.yml --tags=import-generic-sqlite-db --extra-vars='sqlite_database_path={{ matrix_mx_puppet_discord_data_path }}/database.db postgres_connection_string_variable_name=matrix_mx_puppet_discord_database_connString'`)
+        3. Re-run the playbook (`ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start`)
+    when: "matrix_mx_puppet_discord_sqlite_database_path_local_stat_result.stat.exists"
+  when: "matrix_mx_puppet_discord_database_engine == 'postgres'"
diff --git a/roles/matrix-bridge-mx-puppet-discord/templates/config.yaml.j2 b/roles/matrix-bridge-mx-puppet-discord/templates/config.yaml.j2
index 88c591e2f..c24c7e54c 100644
--- a/roles/matrix-bridge-mx-puppet-discord/templates/config.yaml.j2
+++ b/roles/matrix-bridge-mx-puppet-discord/templates/config.yaml.j2
@@ -100,15 +100,18 @@ namePatterns:
   group: :name
 
 database:
+{% if matrix_mx_puppet_slack_discord_database_engine == 'sqlite' %}
+  # Use SQLite3 as a database backend
+  # The name of the database file
+  filename: /data/database.db
+{% else %}
   # Use Postgres as a database backend
   # If set, will be used instead of SQLite3
   # Connection string to connect to the Postgres instance
   # with username "user", password "pass", host "localhost" and database name "dbname".
   # Modify each value as necessary
-  connString: "postgres://matrix_puppet_discord:{{ matrix_additional_databases | selectattr('name', 'equalto', 'matrix_puppet_discord') | map(attribute='pass') | first }}@{{ matrix_postgres_connection_hostname }}/matrix_puppet_discord?sslmode=disable"
-  # Use SQLite3 as a database backend
-  # The name of the database file
-  #filename: /data/database.db
+  connString: {{ matrix_mx_puppet_discord_database_connString|to_json }}
+{% endif %}
 
 logging:
   # Log level of console output
diff --git a/roles/matrix-bridge-mx-puppet-instagram/defaults/main.yml b/roles/matrix-bridge-mx-puppet-instagram/defaults/main.yml
index 21cde53fa..c30f9b8b3 100644
--- a/roles/matrix-bridge-mx-puppet-instagram/defaults/main.yml
+++ b/roles/matrix-bridge-mx-puppet-instagram/defaults/main.yml
@@ -46,6 +46,20 @@ matrix_mx_puppet_instagram_homeserver_token: ''
 # Can be set to enable automatic double-puppeting via Shared Secret Auth (https://github.com/devture/matrix-synapse-shared-secret-auth).
 matrix_mx_puppet_instagram_login_shared_secret: ''
 
+matrix_mx_puppet_instagram_database_engine: sqlite
+matrix_mx_puppet_instagram_database_username: matrix_mx_puppet_instagram
+matrix_mx_puppet_instagram_database_password: ~
+matrix_mx_puppet_instagram_database_hostname: 'matrix-postgres'
+matrix_mx_puppet_instagram_database_port: 5432
+matrix_mx_puppet_instagram_database_name: matrix_mx_puppet_instagram
+matrix_mx_puppet_instagram_database_file: /data/database.db
+matrix_mx_puppet_instagram_database_connString: >-2
+  {%- if matrix_mx_puppet_instagram_database_engine == 'postgres' -%}
+  postgresql://{{ matrix_mx_puppet_instagram_database_username }}:{{ matrix_mx_puppet_instagram_database_password }}@{{ matrix_mx_puppet_instagram_database_hostname }}:{{ matrix_mx_puppet_instagram_database_port }}/{{ matrix_mx_puppet_instagram_database_name }}?sslmode=disable
+  {%- else if matrix_mx_puppet_instagram_database_engine == 'sqlite' -%}
+  {{ matrix_mx_puppet_instagram_database_engine }}://{{ matrix_mx_puppet_instagram_database_file }}
+  {%- endif -%}
+
 # Default configuration template which covers the generic use case.
 # You can customize it by controlling the various variables inside it.
 #
diff --git a/roles/matrix-bridge-mx-puppet-instagram/tasks/validate_config.yml b/roles/matrix-bridge-mx-puppet-instagram/tasks/validate_config.yml
index b6d9d994e..7000a8a17 100644
--- a/roles/matrix-bridge-mx-puppet-instagram/tasks/validate_config.yml
+++ b/roles/matrix-bridge-mx-puppet-instagram/tasks/validate_config.yml
@@ -8,3 +8,24 @@
   with_items:
     - "matrix_mx_puppet_instagram_appservice_token"
     - "matrix_mx_puppet_instagram_homeserver_token"
+
+- block:
+  - name: Check if an SQLite database already exists
+    stat:
+      path: "{{ matrix_mx_puppet_instagram_data_path }}/database.db"
+    register: matrix_mx_puppet_instagram_sqlite_database_path_local_stat_result
+
+   - name: Fail if an SQLite database already exists when using Postgres
+    fail:
+      msg: >-
+        matrix_mx_puppet_instagram_database_engine has been set to `postgres` (which is our new default now).
+        However, we've discovered an existing SQLite database in {{ matrix_mx_puppet_instagram_data_path }}/database.db.
+        It appears that you've been using this bridge with the SQLite engine until now.
+        To continue using SQLite, opt into it explicitly: add `matrix_mx_puppet_instagram_database_engine: sqlite` to your vars.yml file and re-run this same command.
+        Alternatively, to migrate your existing SQLite database to Postgres:
+        1. Stop all services (`ansible-playbook -i inventory/hosts setup.yml --tags=stop`)
+        2. Import the SQLite database into Postgres (`ansible-playbook -v -i inventory/hosts setup.yml --tags=import-generic-sqlite-db --extra-vars='sqlite_database_path={{ matrix_mx_puppet_instagram_data_path }}/database.db postgres_connection_string_variable_name=matrix_mx_puppet_instagram_database_connString'`)
+        3. Re-run the playbook (`ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start`)
+    when: "matrix_mx_puppet_instagram_sqlite_database_path_local_stat_result.stat.exists"
+  when: "matrix_mx_puppet_instagram_database_engine == 'postgres'"
+
diff --git a/roles/matrix-bridge-mx-puppet-instagram/templates/config.yaml.j2 b/roles/matrix-bridge-mx-puppet-instagram/templates/config.yaml.j2
index 2d1891957..d89c5bdb2 100644
--- a/roles/matrix-bridge-mx-puppet-instagram/templates/config.yaml.j2
+++ b/roles/matrix-bridge-mx-puppet-instagram/templates/config.yaml.j2
@@ -44,15 +44,18 @@ provisioning:
   apiPrefix: /_matrix/provision
 
 database:
+{% if matrix_mx_puppet_instagram_database_engine == 'postgres' %}
   # Use Postgres as a database backend
   # If set, will be used instead of SQLite3
   # Connection string to connect to the Postgres instance
   # with username "user", password "pass", host "localhost" and database name "dbname".
   # Modify each value as necessary
-  connString: "postgres://matrix_puppet_instagram:{{ matrix_additional_databases | selectattr('name', 'equalto', 'matrix_puppet_instagram') | map(attribute='pass') | first }}@{{ matrix_postgres_connection_hostname }}/matrix_puppet_instagram?sslmode=disable"
+  connString: {{ matrix_mx_puppet_instagram_database_connString | to_json }}
+{% else %}
   # Use SQLite3 as a database backend
   # The name of the database file
-  #filename: /data/database.db
+  filename: {{ matrix_mx_puppet_instagram_database_file }}
+{% endif %}
 
 logging:
   # Log level of console output
diff --git a/roles/matrix-bridge-mx-puppet-skype/defaults/main.yml b/roles/matrix-bridge-mx-puppet-skype/defaults/main.yml
index 0c16a8bab..3b7448c66 100644
--- a/roles/matrix-bridge-mx-puppet-skype/defaults/main.yml
+++ b/roles/matrix-bridge-mx-puppet-skype/defaults/main.yml
@@ -53,6 +53,21 @@ matrix_mx_puppet_skype_homeserver_token: ''
 # Can be set to enable automatic double-puppeting via Shared Secret Auth (https://github.com/devture/matrix-synapse-shared-secret-auth).
 matrix_mx_puppet_skype_login_shared_secret: ''
 
+# Database configuration, role default is `sqlite` but playbook default is `postgres`
+matrix_mx_puppet_skype_database_engine: sqlite
+matrix_mx_puppet_skype_database_username: matrix_mx_puppet_skype
+matrix_mx_puppet_skype_database_password: ~
+matrix_mx_puppet_skype_database_hostname: 'matrix-postgres'
+matrix_mx_puppet_skype_database_port: 5432
+matrix_mx_puppet_skype_database_name: matrix_mx_puppet_skype
+matrix_mx_puppet_skype_database_file: /data/database.db
+matrix_mx_puppet_skype_database_connString: >-2
+  {%- if matrix_mx_puppet_skype_database_engine == 'postgres' -%}
+  postgresql://{{ matrix_mx_puppet_skype_database_username }}:{{ matrix_mx_puppet_skype_database_password }}@{{ matrix_mx_puppet_skype_database_hostname }}:{{ matrix_mx_puppet_skype_database_port }}/{{ matrix_mx_puppet_skype_database_name }}?sslmode=disable
+  {%- else if matrix_mx_puppet_skype_database_engine == 'sqlite' -%}
+  {{ matrix_mx_puppet_skype_database_engine }}://{{ matrix_mx_puppet_skype_database_file }}
+  {%- endif -%}
+
 # Default configuration template which covers the generic use case.
 # You can customize it by controlling the various variables inside it.
 #
diff --git a/roles/matrix-bridge-mx-puppet-skype/tasks/validate_config.yml b/roles/matrix-bridge-mx-puppet-skype/tasks/validate_config.yml
index 7ed433b12..c7100e51a 100644
--- a/roles/matrix-bridge-mx-puppet-skype/tasks/validate_config.yml
+++ b/roles/matrix-bridge-mx-puppet-skype/tasks/validate_config.yml
@@ -8,3 +8,23 @@
   with_items:
     - "matrix_mx_puppet_skype_appservice_token"
     - "matrix_mx_puppet_skype_homeserver_token"
+
+- block:
+  - name: Check if an SQLite database already exists
+    stat:
+      path: "{{ matrix_mx_puppet_skype_data_path }}/database.db"
+    register: matrix_mx_puppet_skype_sqlite_database_path_local_stat_result
+
+  - name: Fail if an SQLite database already exists when using Postgres
+    fail:
+      msg: >-
+        matrix_mx_puppet_skype_database_engine has been set to `postgres` (which is our new default now).
+        However, we've discovered an existing SQLite database in {{ matrix_mx_puppet_skype_data_path }}/database.db.
+        It appears that you've been using this bridge with the SQLite engine until now.
+        To continue using SQLite, opt into it explicitly: add `matrix_mx_puppet_skype_database_engine: sqlite` to your vars.yml file and re-run this same command.
+        Alternatively, to migrate your existing SQLite database to Postgres:
+        1. Stop all services (`ansible-playbook -i inventory/hosts setup.yml --tags=stop`)
+        2. Import the SQLite database into Postgres (`ansible-playbook -v -i inventory/hosts setup.yml --tags=import-generic-sqlite-db --extra-vars='sqlite_database_path={{ matrix_mx_puppet_skype_data_path }}/database.db postgres_connection_string_variable_name=matrix_mx_puppet_skype_database_connString'`)
+        3. Re-run the playbook (`ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start`)
+    when: "matrix_mx_puppet_skype_sqlite_database_path_local_stat_result.stat.exists"
+  when: "matrix_mx_puppet_skype_database_engine == 'postgres'"
diff --git a/roles/matrix-bridge-mx-puppet-skype/templates/config.yaml.j2 b/roles/matrix-bridge-mx-puppet-skype/templates/config.yaml.j2
index a54ca758b..a32523b1c 100644
--- a/roles/matrix-bridge-mx-puppet-skype/templates/config.yaml.j2
+++ b/roles/matrix-bridge-mx-puppet-skype/templates/config.yaml.j2
@@ -68,15 +68,18 @@ logging:
       #  - Store
 
 database:
+{% if matrix_mx_puppet_skype_database_engine == 'postgres' %}
   # Use Postgres as a database backend
   # If set, will be used instead of SQLite3
   # Connection string to connect to the Postgres instance
   # with username "user", password "pass", host "localhost" and database name "dbname".
   # Modify each value as necessary
-  connString: "postgres://matrix_puppet_skype:{{ matrix_additional_databases | selectattr('name', 'equalto', 'matrix_puppet_skype') | map(attribute='pass') | first }}@{{ matrix_postgres_connection_hostname }}/matrix_puppet_skype?sslmode=disable"
+  connString: {{ matrix_mx_puppet_skype_database_connString | to_json }}
+{% else %}
   # Use SQLite3 as a database backend
   # The name of the database file
-  #filename: /data/database.db
+  filename: {{ matrix_mx_puppet_skype_database_file }}
+{% endif %}
 
 provisioning:
   # Regex of Matrix IDs allowed to use the puppet bridge
diff --git a/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml b/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml
index 96ab78331..5f91beb8d 100644
--- a/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml
+++ b/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml
@@ -57,6 +57,21 @@ matrix_mx_puppet_slack_homeserver_token: ''
 # Can be set to enable automatic double-puppeting via Shared Secret Auth (https://github.com/devture/matrix-synapse-shared-secret-auth).
 matrix_mx_puppet_slack_login_shared_secret: ''
 
+# Database configuration, role uses 'sqlite' per default but playbook sets up postgres by default
+matrix_mx_puppet_slack_database_engine: sqlite
+matrix_mx_puppet_slack_database_username: matrix_mx_puppet_slack
+matrix_mx_puppet_slack_database_password: ~
+matrix_mx_puppet_slack_database_hostname: 'matrix-postgres'
+matrix_mx_puppet_slack_database_port: 5432
+matrix_mx_puppet_slack_database_name: matrix_mx_puppet_slack
+matrix_mx_puppet_slack_database_file: /data/database.db
+matrix_mx_puppet_slack_database_connString: >-2
+  {%- if matrix_mx_puppet_slack_database_engine == 'postgres' -%}
+  postgresql://{{ matrix_mx_puppet_slack_database_username }}:{{ matrix_mx_puppet_slack_database_password }}@{{ matrix_mx_puppet_slack_database_hostname }}:{{ matrix_mx_puppet_slack_database_port }}/{{ matrix_mx_puppet_slack_database_name }}?sslmode=disable
+  {%- else if matrix_mx_puppet_slack_database_engine == 'sqlite' -%}
+  {{ matrix_mx_puppet_slack_database_engine }}://{{ matrix_mx_puppet_slack_database_file }}
+  {%- endif -%}
+
 # Default configuration template which covers the generic use case.
 # You can customize it by controlling the various variables inside it.
 #
diff --git a/roles/matrix-bridge-mx-puppet-slack/tasks/validate_config.yml b/roles/matrix-bridge-mx-puppet-slack/tasks/validate_config.yml
index 3a0bca111..bc722ee63 100644
--- a/roles/matrix-bridge-mx-puppet-slack/tasks/validate_config.yml
+++ b/roles/matrix-bridge-mx-puppet-slack/tasks/validate_config.yml
@@ -8,3 +8,23 @@
   with_items:
     - "matrix_mx_puppet_slack_appservice_token"
     - "matrix_mx_puppet_slack_homeserver_token"
+
+- block:
+  - name: Check if sqlite database already exists
+    stat:
+      path: "{{ matrix_mx_puppet_slack_data_path }}/database.db"
+    register: matrix_mx_puppet_slack_sqlite_database_path_local_stat_result
+
+  - name: Fail if an SQLite database already exists when using Postgres
+    fail:
+      msg: >-
+        matrix_mx_puppet_slack_database_engine has been set to `postgres` (which is our new default now).
+        However, we've discovered an existing SQLite database in {{ matrix_mx_puppet_slack_data_path }}/database.db.
+        It appears that you've been using this bridge with the SQLite engine until now.
+        To continue using SQLite, opt into it explicitly: add `matrix_mx_puppet_slack_database_engine: sqlite` to your vars.yml file and re-run this same command.
+        Alternatively, to migrate your existing SQLite database to Postgres:
+        1. Stop all services (`ansible-playbook -i inventory/hosts setup.yml --tags=stop`)
+        2. Import the SQLite database into Postgres (`ansible-playbook -v -i inventory/hosts setup.yml --tags=import-generic-sqlite-db --extra-vars='sqlite_database_path={{ matrix_mx_puppet_slack_data_path }}/database.db postgres_connection_string_variable_name=matrix_mx_puppet_slack_database_connString'`)
+        3. Re-run the playbook (`ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start`)
+    when: "matrix_mx_puppet_slack_sqlite_database_path_local_stat_result.stat.exists"
+  when: "matrix_mx_puppet_slack_database_engine == 'postgres'"
diff --git a/roles/matrix-bridge-mx-puppet-slack/templates/config.yaml.j2 b/roles/matrix-bridge-mx-puppet-slack/templates/config.yaml.j2
index 7f1b21d78..58c5c11ab 100644
--- a/roles/matrix-bridge-mx-puppet-slack/templates/config.yaml.j2
+++ b/roles/matrix-bridge-mx-puppet-slack/templates/config.yaml.j2
@@ -58,15 +58,18 @@ provisioning:
   apiPrefix: /_matrix/provision
 
 database:
+{% if matrix_mx_puppet_slack_database_engine == 'postgres' %}
   # Use Postgres as a database backend
   # If set, will be used instead of SQLite3
   # Connection string to connect to the Postgres instance
   # with username "user", password "pass", host "localhost" and database name "dbname".
   # Modify each value as necessary
-  connString: "postgres://matrix_puppet_slack:{{ matrix_additional_databases | selectattr('name', 'equalto', 'matrix_puppet_slack') | map(attribute='pass') | first }}@{{ matrix_postgres_connection_hostname }}/matrix_puppet_slack?sslmode=disable"
+  connString: {{ matrix_mx_puppet_slack_database_connString | to_json }}
+{% else %}
   # Use SQLite3 as a database backend
   # The name of the database file
-  #filename: /data/database.db
+  filename: {{ matrix_mx_puppet_slack_database_file }}
+{% endif %}
 
 logging:
   # Log level of console output
diff --git a/roles/matrix-bridge-mx-puppet-steam/defaults/main.yml b/roles/matrix-bridge-mx-puppet-steam/defaults/main.yml
index b5eb84731..be343db45 100644
--- a/roles/matrix-bridge-mx-puppet-steam/defaults/main.yml
+++ b/roles/matrix-bridge-mx-puppet-steam/defaults/main.yml
@@ -55,6 +55,20 @@ matrix_mx_puppet_steam_homeserver_token: ''
 # Can be set to enable automatic double-puppeting via Shared Secret Auth (https://github.com/devture/matrix-synapse-shared-secret-auth).
 matrix_mx_puppet_steam_login_shared_secret: ''
 
+matrix_mx_puppet_steam_database_engine: sqlite
+matrix_mx_puppet_steam_database_username: matrix_mx_puppet_steam
+matrix_mx_puppet_steam_database_password: ~
+matrix_mx_puppet_steam_database_hostname: 'matrix-postgres'
+matrix_mx_puppet_steam_database_port: 5432
+matrix_mx_puppet_steam_database_name: matrix_mx_puppet_steam
+matrix_mx_puppet_steam_database_file: /data/database.db
+matrix_mx_puppet_steam_database_connString: >-2
+  {%- if matrix_mx_puppet_steam_database_engine == 'postgres' -%}
+  postgresql://{{ matrix_mx_puppet_steam_database_username }}:{{ matrix_mx_puppet_steam_database_password }}@{{ matrix_mx_puppet_steam_database_hostname }}:{{ matrix_mx_puppet_steam_database_port }}/{{ matrix_mx_puppet_steam_database_name }}?sslmode=disable
+  {%- else if matrix_mx_puppet_steam_database_engine == 'sqlite' -%}
+  {{ matrix_mx_puppet_steam_database_engine }}://{{ matrix_mx_puppet_steam_database_file }}
+  {%- endif -%}
+
 # Default configuration template which covers the generic use case.
 # You can customize it by controlling the various variables inside it.
 #
diff --git a/roles/matrix-bridge-mx-puppet-steam/tasks/validate_config.yml b/roles/matrix-bridge-mx-puppet-steam/tasks/validate_config.yml
index a8bc6a420..50ce15d9d 100644
--- a/roles/matrix-bridge-mx-puppet-steam/tasks/validate_config.yml
+++ b/roles/matrix-bridge-mx-puppet-steam/tasks/validate_config.yml
@@ -8,3 +8,25 @@
   with_items:
     - "matrix_mx_puppet_steam_appservice_token"
     - "matrix_mx_puppet_steam_homeserver_token"
+
+- block:
+  - name: Check if an SQLite database already exists
+    stat:
+      path: "{{ matrix_mx_puppet_steam_data_path }}"
+    register: matrix_mx_puppet_steam_sqlite_database_path_local_stat_result
+
+  - name: Fail if an SQLite database already exists when using Postgres
+    fail:
+      msg: >-
+        matrix_mx_puppet_steam_database_engine has been set to `postgres` (which is our new default now).
+        However, we've discovered an existing SQLite database in {{ matrix_mx_puppet_steam_data_path }}/database.db.
+        It appears that you've been using this bridge with the SQLite engine until now.
+        To continue using SQLite, opt into it explicitly: add `matrix_mx_puppet_steam_database_engine: sqlite` to your vars.yml file and re-run this same command.
+        Alternatively, to migrate your existing SQLite database to Postgres:
+        1. Stop all services (`ansible-playbook -i inventory/hosts setup.yml --tags=stop`)
+        2. Import the SQLite database into Postgres (`ansible-playbook -v -i inventory/hosts setup.yml --tags=import-generic-sqlite-db --extra-vars='sqlite_database_path={{ matrix_mx_puppet_steam_data_path }}/database.db postgres_connection_string_variable_name=matrix_mx_puppet_steam_database_connString'`)
+        3. Re-run the playbook (`ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start`)
+    when: "matrix_mx_puppet_steam_sqlite_database_path_local_stat_result.stat.exists"
+  when: "matrix_mx_puppet_steam_database_engine == 'postgres'"
+
+
diff --git a/roles/matrix-bridge-mx-puppet-steam/templates/config.yaml.j2 b/roles/matrix-bridge-mx-puppet-steam/templates/config.yaml.j2
index 14f863196..8eda278dd 100644
--- a/roles/matrix-bridge-mx-puppet-steam/templates/config.yaml.j2
+++ b/roles/matrix-bridge-mx-puppet-steam/templates/config.yaml.j2
@@ -61,15 +61,18 @@ selfService:
   blacklist: {{ matrix_mx_puppet_steam_provisioning_blacklist|to_json }}
 
 database:
+{% if matrix_mx_puppet_steam_database_engine == 'postgres' %}
   # Use Postgres as a database backend
   # If set, will be used instead of SQLite3
   # Connection string to connect to the Postgres instance
   # with username "user", password "pass", host "localhost" and database name "dbname".
   # Modify each value as necessary
-  connString: "postgres://matrix_puppet_steam:{{ matrix_additional_databases | selectattr('name', 'equalto', 'matrix_puppet_steam') | map(attribute='pass') | first }}@{{ matrix_postgres_connection_hostname }}/matrix_puppet_steam?sslmode=disable"
+  connString: {{ matrix_mx_puppet_steam_database_connString | to_json }}
+{% else %}
   # Use SQLite3 as a database backend
   # The name of the database file
-  #filename: /data/database.db
+  filename: {{ matrix_mx_puppet_steam_database_file }}
+{% endif %}
 
 logging:
   # Log level of console output
diff --git a/roles/matrix-bridge-mx-puppet-twitter/defaults/main.yml b/roles/matrix-bridge-mx-puppet-twitter/defaults/main.yml
index 13438a21f..f536029c0 100644
--- a/roles/matrix-bridge-mx-puppet-twitter/defaults/main.yml
+++ b/roles/matrix-bridge-mx-puppet-twitter/defaults/main.yml
@@ -60,6 +60,21 @@ matrix_mx_puppet_twitter_homeserver_token: ''
 # Can be set to enable automatic double-puppeting via Shared Secret Auth (https://github.com/devture/matrix-synapse-shared-secret-auth).
 matrix_mx_puppet_twitter_login_shared_secret: ''
 
+# Database configuration
+matrix_mx_puppet_twitter_database_engine: sqlite
+matrix_mx_puppet_twitter_database_username: matrix:mx_puppet_twitter
+matrix_mx_puppet_twitter_database_password: ~
+matrix_mx_puppet_twitter_database_hostname: 'matrix-postgres'
+matrix_mx_puppet_twitter_database_port: 5432
+matrix_mx_puppet_twitter_database_name: matrix_mx_puppet_twitter
+matrix_mx_puppet_twitter_database_file: /data/database.db
+matrix_mx_puppet_twitter_database_connString: >-2
+  {%- if matrix_mx_puppet_twitter_database_engine == 'postgres' -%}
+  postgresql://{{ matrix_mx_puppet_twitter_database_username }}:{{ matrix_mx_puppet_twitter_database_password }}@{{ matrix_mx_puppet_twitter_database_hostname }}:{{ matrix_mx_puppet_twitter_database_port }}/{{ matrix_mx_puppet_twitter_database_name }}?sslmode=disable
+  {%- else if matrix_mx_puppet_twitter_database_engine == 'sqlite' -%}
+  {{ matrix_mx_puppet_twitter_database_engine }}://{{ matrix_mx_puppet_twitter_database_file }}
+  {%- endif -%}
+
 # Default configuration template which covers the generic use case.
 # You can customize it by controlling the various variables inside it.
 #
diff --git a/roles/matrix-bridge-mx-puppet-twitter/tasks/validate_config.yml b/roles/matrix-bridge-mx-puppet-twitter/tasks/validate_config.yml
index d13a39e1e..0b3bd8f82 100644
--- a/roles/matrix-bridge-mx-puppet-twitter/tasks/validate_config.yml
+++ b/roles/matrix-bridge-mx-puppet-twitter/tasks/validate_config.yml
@@ -8,3 +8,25 @@
   with_items:
     - "matrix_mx_puppet_twitter_appservice_token"
     - "matrix_mx_puppet_twitter_homeserver_token"
+
+- block:
+  - name: Check if an SQLite database already exists
+    stat:
+      path: "{{ matrix_mx_puppet_twitter_sqlite_data_path }}/database.db"
+    register: matrix_mx_puppet_twitter_sqlite_database_path_local_stat_result
+
+  - name: Fail if an SQLite database already exists when using Postgres
+    fail:
+      msg: >-
+        matrix_mx_puppet_twitter_database_engine has been set to `postgres` (which is our new default now).
+        However, we've discovered an existing SQLite database in {{ matrix_mx_puppet_twitter_data_path }}/database.db.
+        It appears that you've been using this bridge with the SQLite engine until now.
+        To continue using SQLite, opt into it explicitly: add `matrix_mx_puppet_twitter_database_engine: sqlite` to your vars.yml file and re-run this same command.
+        Alternatively, to migrate your existing SQLite database to Postgres:
+        1. Stop all services (`ansible-playbook -i inventory/hosts setup.yml --tags=stop`)
+        2. Import the SQLite database into Postgres (`ansible-playbook -v -i inventory/hosts setup.yml --tags=import-generic-sqlite-db --extra-vars='sqlite_database_path={{ matrix_mx_puppet_twitter_data_path }}/database.db postgres_connection_string_variable_name=matrix_mx_puppet_twitter_database_connString'`)
+        3. Re-run the playbook (`ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start`)
+    when: "matrix_mx_puppet_twitter_sqlite_database_path_local_stat_result.stat.exists"
+  when: "matrix_mx_puppet_twitter_database_engine == 'postgres'"
+
+
diff --git a/roles/matrix-bridge-mx-puppet-twitter/templates/config.yaml.j2 b/roles/matrix-bridge-mx-puppet-twitter/templates/config.yaml.j2
index 853d23fc2..cecb171d9 100644
--- a/roles/matrix-bridge-mx-puppet-twitter/templates/config.yaml.j2
+++ b/roles/matrix-bridge-mx-puppet-twitter/templates/config.yaml.j2
@@ -54,15 +54,18 @@ provisioning:
   apiPrefix: /_matrix/provision
 
 database:
+{% if matrix_mx_puppet_twitter_database_engine == 'postgres' %}
   # Use Postgres as a database backend
   # If set, will be used instead of SQLite3
   # Connection string to connect to the Postgres instance
   # with username "user", password "pass", host "localhost" and database name "dbname".
   # Modify each value as necessary
-  connString: "postgres://matrix_puppet_twitter:{{ matrix_additional_databases | selectattr('name', 'equalto', 'matrix_puppet_twitter') | map(attribute='pass') | first }}@{{ matrix_postgres_connection_hostname }}/matrix_puppet_twitter?sslmode=disable"
+  connString: {{ matrix_mx_puppet_twitter_database_connString | to_json }}
+{% else %}
   # Use SQLite3 as a database backend
   # The name of the database file
-  #filename: /data/database.db
+  filename: {{ matrix_mx_puppet_twitter_database_file }}
+{% endif %}
 
 logging:
   # Log level of console output