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docs/design/data-model.md

@@ -229,7 +229,7 @@ The `recent_emails` field stores an array of JSON objects:
 
 ## Folder Types
 
-The system supports two distinct types of folders, each with different purposes and behaviors:
+The system supports three distinct types of folders, each with different purposes and behaviors:
 
 ### Tidy Folders
 
@@ -261,14 +261,35 @@ Folders with `folder_type = 'destination'` are target folders where emails are m
 - Simpler interface without pending/processed indicators
 - Focus on folder management and viewing contents
 
+### Ignore Folders
+
+Folders with `folder_type = 'ignore'` are folders that are stored in the database but are neither scanned to be tidied nor used as destination folders.
+
+**Characteristics:**
+- Hidden by default in the user interface
+- Not processed by AI for organization
+- No organization rules specified
+- Known emails count is reset to 0 when changed to this type
+- Example: Archive, Spam, Drafts folders
+
+**UI Representation:**
+- Hidden by default unless "Show Hidden" checkbox is checked
+- When visible, shows minimal information
+- No action buttons for organization or processing
+
 ### Folder Type Determination
 
 Folder types are determined as follows:
 - During IMAP synchronization:
-  - Folders named "inbox" (case-insensitive) are automatically set as 'tidy'
-  - All other folders are set as 'destination'
+  - First step: Connection testing
+  - Second step: Folder type selection modal with table
+  - Default folder types:
+    - Inbox: Tidy
+    - Archive/Spam/Drafts: Ignore
+    - All others: Destination
 - Manually created folders default to 'destination'
-- Folder type can be changed through administrative functions
+- Folder type can be changed through the user interface
+- When changing to 'ignore', emails_count is reset to 0
 
 ## Future Data Model Considerations