diff --git a/diagrams/admin-erd.mmd b/diagrams/admin-erd.mmd
new file mode 100644
index 000000000..17766f15c
--- /dev/null
+++ b/diagrams/admin-erd.mmd
@@ -0,0 +1,80 @@
+classDiagram
+	direction RL
+	class `CreateFormService::CreateFormEvent`
+	`CreateFormService::CreateFormEvent` : +integer dedup_version
+	`CreateFormService::CreateFormEvent` : +integer form_id
+	`CreateFormService::CreateFormEvent` : +string form_name
+	class `DraftQuestion`
+	`DraftQuestion` : +jsonb answer_settings
+	`DraftQuestion` : +text answer_type
+	`DraftQuestion` : +integer form_id
+	`DraftQuestion` : +text guidance_markdown
+	`DraftQuestion` : +text hint_text
+	`DraftQuestion` : +boolean is_optional
+	`DraftQuestion` : +boolean is_repeatable
+	`DraftQuestion` : +text page_heading
+	`DraftQuestion` : +integer page_id
+	`DraftQuestion` : +text question_text
+	class `FormSubmissionEmail`
+	`FormSubmissionEmail` : +string confirmation_code
+	`FormSubmissionEmail` : +string created_by_email
+	`FormSubmissionEmail` : +string created_by_name
+	`FormSubmissionEmail` : +integer form_id
+	`FormSubmissionEmail` : +string temporary_submission_email
+	`FormSubmissionEmail` : +string updated_by_email
+	`FormSubmissionEmail` : +string updated_by_name
+	class `Group`
+	`Group` : +boolean branch_routing_enabled
+	`Group` : +boolean exit_pages_enabled
+	`Group` : +text external_id
+	`Group` : +boolean file_upload_enabled
+	`Group` : +string name
+	`Group` : +string status
+	class `GroupForm`
+	`GroupForm` : +integer form_id
+	class `Membership`
+	`Membership` : +string role
+	class `MouSignature`
+	class `Organisation`
+	`Organisation` : +string abbreviation
+	`Organisation` : +boolean closed
+	`Organisation` : +integer default_group_id
+	`Organisation` : +string govuk_content_id
+	`Organisation` : +boolean internal
+	`Organisation` : +string name
+	`Organisation` : +string slug
+	class `PaperTrail::Version`
+	`PaperTrail::Version` : +string event
+	`PaperTrail::Version` : +string item_type
+	`PaperTrail::Version` : +jsonb object
+	`PaperTrail::Version` : +jsonb object_changes
+	`PaperTrail::Version` : +string whodunnit
+	class `User`
+	`User` : +string app_name
+	`User` : +boolean disabled
+	`User` : +string email
+	`User` : +boolean has_access
+	`User` : +datetime last_signed_in_at
+	`User` : +string name
+	`User` : +string organisation_content_id
+	`User` : +string organisation_slug
+	`User` : +text permissions
+	`User` : +string provider
+	`User` : +boolean remotely_signed_out
+	`User` : +string role
+	`User` : +datetime terms_agreed_at
+	`User` : +string uid
+	`Item` --> `PaperTrail::Version`
+	`Organisation` --> `PaperTrail::Version`
+	`User` --> `PaperTrail::Version`
+	`User` --> `CreateFormService::CreateFormEvent`
+	`Group` --> `CreateFormService::CreateFormEvent`
+	`Organisation` --> `User`
+	`User` --> `Membership`
+	`User` ..> `Group`
+	`User` --> `MouSignature`
+	`User` --> `DraftQuestion`
+	`Organisation` --> `Group`
+	`Organisation` --> `MouSignature`
+	`Group` --> `Membership`
+	`Group` --> `GroupForm`
\ No newline at end of file
diff --git a/diagrams/api-erd.mmd b/diagrams/api-erd.mmd
new file mode 100644
index 000000000..4576c53c4
--- /dev/null
+++ b/diagrams/api-erd.mmd
@@ -0,0 +1,89 @@
+classDiagram
+	direction RL
+	class `AccessToken`
+	`AccessToken` : +datetime deactivated_at
+	`AccessToken` : +string description
+	`AccessToken` : +datetime last_accessed_at
+	`AccessToken` : +string owner
+	`AccessToken` : +string token_digest
+	class `Api::V2::Form`
+	`Api::V2::Form` : +integer creator_id
+	`Api::V2::Form` : +boolean declaration_section_completed
+	`Api::V2::Form` : +text declaration_text
+	`Api::V2::Form` : +string external_id
+	`Api::V2::Form` : +text form_slug
+	`Api::V2::Form` : +text name
+	`Api::V2::Form` : +string payment_url
+	`Api::V2::Form` : +text privacy_policy_url
+	`Api::V2::Form` : +boolean question_section_completed
+	`Api::V2::Form` : +string s3_bucket_aws_account_id
+	`Api::V2::Form` : +string s3_bucket_name
+	`Api::V2::Form` : +string s3_bucket_region
+	`Api::V2::Form` : +boolean share_preview_completed
+	`Api::V2::Form` : +string state
+	`Api::V2::Form` : +text submission_email
+	`Api::V2::Form` : +string submission_type
+	`Api::V2::Form` : +text support_email
+	`Api::V2::Form` : +text support_phone
+	`Api::V2::Form` : +text support_url
+	`Api::V2::Form` : +text support_url_text
+	`Api::V2::Form` : +text what_happens_next_markdown
+	class `Api::V2::FormDocument`
+	`Api::V2::FormDocument` : +jsonb content
+	`Api::V2::FormDocument` : +text tag
+	class `Condition`
+	`Condition` : +string answer_value
+	`Condition` : +text exit_page_heading
+	`Condition` : +text exit_page_markdown
+	`Condition` : +boolean skip_to_end
+	class `Form`
+	`Form` : +integer creator_id
+	`Form` : +boolean declaration_section_completed
+	`Form` : +text declaration_text
+	`Form` : +string external_id
+	`Form` : +text form_slug
+	`Form` : +text name
+	`Form` : +string payment_url
+	`Form` : +text privacy_policy_url
+	`Form` : +boolean question_section_completed
+	`Form` : +string s3_bucket_aws_account_id
+	`Form` : +string s3_bucket_name
+	`Form` : +string s3_bucket_region
+	`Form` : +boolean share_preview_completed
+	`Form` : +string state
+	`Form` : +text submission_email
+	`Form` : +string submission_type
+	`Form` : +text support_email
+	`Form` : +text support_phone
+	`Form` : +text support_url
+	`Form` : +text support_url_text
+	`Form` : +text what_happens_next_markdown
+	class `MadeLiveForm`
+	`MadeLiveForm` : +json json_form_blob
+	class `Page`
+	`Page` : +jsonb answer_settings
+	`Page` : +text answer_type
+	`Page` : +text guidance_markdown
+	`Page` : +text hint_text
+	`Page` : +boolean is_optional
+	`Page` : +boolean is_repeatable
+	`Page` : +integer next_page
+	`Page` : +text page_heading
+	`Page` : +integer position
+	`Page` : +text question_text
+	class `PaperTrail::Version`
+	`PaperTrail::Version` : +string event
+	`PaperTrail::Version` : +string item_type
+	`PaperTrail::Version` : +jsonb object
+	`PaperTrail::Version` : +jsonb object_changes
+	`PaperTrail::Version` : +string whodunnit
+	`Item` --> `PaperTrail::Version`
+	`Condition` --> `PaperTrail::Version`
+	`Form` --> `PaperTrail::Version`
+	`Page` --> `PaperTrail::Version`
+	`Api::V2::Form` --> `Api::V2::FormDocument`
+	`Form` --> `Page`
+	`Page` --> `Condition`
+	`Form` --> `MadeLiveForm`
+	`Form` --> `Api::V2::FormDocument`
+	`Condition` .. `Form`
\ No newline at end of file
diff --git a/diagrams/runner-erd.mmd b/diagrams/runner-erd.mmd
new file mode 100644
index 000000000..4c74ae7f6
--- /dev/null
+++ b/diagrams/runner-erd.mmd
@@ -0,0 +1,11 @@
+classDiagram
+	direction RL
+	class `Submission`
+	`Submission` : +jsonb answers
+	`Submission` : +jsonb form_document
+	`Submission` : +integer form_id
+	`Submission` : +string mail_message_id
+	`Submission` : +string mail_status
+	`Submission` : +string mode
+	`Submission` : +string reference
+	`Submission` : +datetime sent_at
\ No newline at end of file