feat: support multiple nango connections

[goranmoomin]

Note

Medium Risk
Medium risk because it changes integration session/disconnect APIs, calendar sync behavior, and Supabase uniqueness constraints to key by integration_id + connection_id, which could affect existing connections and sync data cleanup if mis-migrated.

Overview
Adds multi-account support for Nango-backed integrations by treating connections as (integration_id, connection_id) instead of a single connection per integration.

Updates the backend calendar API to require connection_id in list-calendars/list-events (Google/Outlook) and validates connection status/ownership via a new NangoConnectionState.build_http_client path. The Nango session API now accepts mode (auto/connect/reconnect) plus optional connection_id, and disconnect deletes by connection_id.

Desktop and web UIs are updated to surface multiple connections (add account, pick connection for reconnect/disconnect), and the desktop calendar sync pipeline is refactored to sync per provider and per connectionId, storing connection_id on calendars and filtering/syncing events accordingly (including cleanup for removed calendars). A Supabase migration and upsert conflict target are updated to allow multiple connections per integration, and the Tauri calendar plugin gains list_connection_ids plus connectionId parameters for calendar/event listing.

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[yujonglee]

Note that we need supabase db push before merging this @goranmoomin

[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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Autofix Details

Bugbot Autofix prepared fixes for both issues found in the latest run.

• ✅ Fixed: Auto-mode cleanup deletes all user connections for integration
  • The auto-mode 404 reconnect cleanup now deletes only the stale integration_id+connection_id row via delete_connection_by_connection instead of all user integration rows.
• ✅ Fixed: Failed connection fetch causes sibling calendars to be deleted
  • syncCalendars now tracks per-provider connection fetch errors and skips provider-wide calendar deletion when any connection list call fails, preventing accidental sibling calendar removal.

Or push these changes by commenting:

@cursor push 9fc6081528

Preview (9fc6081528)

diff --git a/apps/desktop/src/services/calendar/ctx.ts b/apps/desktop/src/services/calendar/ctx.ts
--- a/apps/desktop/src/services/calendar/ctx.ts
+++ b/apps/desktop/src/services/calendar/ctx.ts
@@ -100,13 +100,17 @@
       connectionId: string;
       calendars: CalendarListItem[];
     }[] = [];
+    let hadConnectionError = false;
 
     for (const connectionId of connection_ids) {
       const result = await calendarCommands.listCalendars(
         provider,
         connectionId,
       );
-      if (result.status === "error") continue;
+      if (result.status === "error") {
+        hadConnectionError = true;
+        continue;
+      }
       perConnection.push({ connectionId, calendars: result.data });
     }
 
@@ -117,14 +121,16 @@
     store.transaction(() => {
       const removedCalendarIds = new Set<string>();
 
-      for (const rowId of store.getRowIds("calendars")) {
-        const row = store.getRow("calendars", rowId);
-        if (
-          row.provider === provider &&
-          !incomingIds.has(row.tracking_id_calendar as string)
-        ) {
-          removedCalendarIds.add(rowId);
-          store.delRow("calendars", rowId);
+      if (!hadConnectionError) {
+        for (const rowId of store.getRowIds("calendars")) {
+          const row = store.getRow("calendars", rowId);
+          if (
+            row.provider === provider &&
+            !incomingIds.has(row.tracking_id_calendar as string)
+          ) {
+            removedCalendarIds.add(rowId);
+            store.delRow("calendars", rowId);
+          }
         }
       }
 

diff --git a/crates/api-nango/src/routes/connect.rs b/crates/api-nango/src/routes/connect.rs
--- a/crates/api-nango/src/routes/connect.rs
+++ b/crates/api-nango/src/routes/connect.rs
@@ -126,7 +126,10 @@
                         );
                         state
                             .supabase
-                            .delete_connection(&user_id, &body.integration_id)
+                            .delete_connection_by_connection(
+                                &body.integration_id,
+                                &existing.connection_id,
+                            )
                             .await?;
                     }
                     Err(err) => {

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[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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