Support using multiple accounts with moneyflow (#33)

An account selector is shown on login now, and each backend connection
is stored in a separate profile so you can have multiple Monarch or YNAB
accounts, for example. If you have imported Amazon transactions, it is
shown in the account selector (but `moneyflow amazon` also works). If we
want to support multiple Amazon databases, that will have to be another
PR. The user's existing Amazon database or Monarch/YNAB credentials will
be automatically migrated to the new profile system


![account-selector](https://github.com/user-attachments/assets/a53417fc-6b49-47cb-8d59-14e243f9fd1b)

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: wesm

docs/getting-started/quickstart.md

@@ -187,6 +187,11 @@ You're in! Here's what to try:
 - [Editing Transactions](../guide/editing.md) - Master bulk operations
 - [Monarch Money Guide](../guide/monarch.md) - Detailed Monarch-specific documentation
 - [YNAB Guide](../guide/ynab.md) - Detailed YNAB-specific documentation
+- [Amazon Mode](../guide/amazon-mode.md) - Analyze Amazon purchase history
+
+!!! info "Multiple Accounts"
+    moneyflow supports multiple accounts! You can add Monarch, YNAB, and Amazon accounts and switch between them
+    from the account selector on startup.
 
 ---
 

docs/guide/amazon-mode.md

@@ -67,12 +67,26 @@ This shows:
 
 ### 4. Launch the UI
 
+You can access Amazon mode in two ways:
+
+#### Option 1: Account Selector (Recommended)
+
+```bash
+# Launch moneyflow normally
+moneyflow
+```
+
+After importing, Amazon will appear in the account selector alongside your other accounts (Monarch Money, YNAB,
+etc.). Select it with arrow keys or click.
+
+#### Option 2: Direct CLI Command
+
 ```bash
-# Open the terminal UI
+# Open Amazon mode directly
 moneyflow amazon
 ```
 
-Uses the same keyboard-driven interface and features.
+Both methods use the same keyboard-driven interface and features.
 
 ## CSV Format
 
@@ -133,9 +147,21 @@ Amazon mode supports incremental imports, preserving any manual edits you've mad
 4. Only new orders are added - your edits are preserved
 5. Use `--force` flag to re-import and overwrite existing transactions if needed
 
-### Custom Database Location
+### Database Location
+
+**Default Location**:
+
+Amazon data is stored in your profile directory:
+
+```text
+~/.moneyflow/profiles/amazon/amazon.db
+```
+
+This integrates Amazon with your other accounts and allows selection from the account picker.
+
+**Custom Database Location**:
 
-By default, data is stored in `~/.moneyflow/amazon.db`. You can use a custom location:
+You can use a custom location with the `--db-path` flag:
 
 ```bash
 # Use custom database
@@ -192,7 +218,7 @@ moneyflow amazon import ~/Downloads/"Your Orders"
 
 - This is expected if you're re-importing the same data
 - Use `--force` flag to re-import: `moneyflow amazon import --force ~/Downloads/"Your Orders"`
-- Or delete the database and start fresh: `rm ~/.moneyflow/amazon.db`
+- Or delete the database and start fresh: `rm ~/.moneyflow/profiles/amazon/amazon.db`
 
 ### Missing ASIN for some items
 

docs/index.md

@@ -78,6 +78,11 @@ Local credential storage with AES-128 encryption. Your finance credentials stay
 See exactly what changes you're making before saving. All edits are queued and reviewed together.
 </div>
 
+<div class="feature-card" markdown>
+### Multi-Account Support
+Manage multiple accounts (Monarch, YNAB, Amazon) and switch between them seamlessly from the account selector.
+</div>
+
 </div>
 
 ---

docs/reference/changelog.md

@@ -1,5 +1,16 @@
 # Changelog
 
+## v0.7.0 - November 2025
+
+**New:**
+
+- **Multi-account support** - Manage multiple Monarch, YNAB, and Amazon accounts from a single interface
+- **Account selector** - Choose accounts on startup with keyboard navigation (↑/↓, Enter)
+- Keyboard navigation for backend selection screens
+- Amazon mode integrates with account selector (appears alongside Monarch/YNAB)
+
+---
+
 ## v0.6.0 - October 2025
 
 **New:**