Add common issues to Supabase node (#2724)

docs/integrations/builtin/app-nodes/n8n-nodes-base.supabase/common-issues.md

@@ -0,0 +1,57 @@
+---
+#https://www.notion.so/n8n/Frontmatter-432c2b8dff1f43d4b1c8d20075510fe4
+title: Supabase node common issues
+description: Documentation for common issues and questions in the Supabase node in n8n, a workflow automation platform. Includes details of the issue and suggested solutions.
+contentType: integration
+priority: high
+---
+
+# Supabase node common issues
+
+Here are some common errors and issues with the [Supabase node](/integrations/builtin/app-nodes/n8n-nodes-base.supabase/) and steps to resolve or troubleshoot them.
+
+## Filtering rows by metadata
+
+To filter rows by [Supabase metadata](https://supabase.com/docs/guides/ai/python/metadata), set the **Select Type** to **String**.
+
+From there, you can construct a query in the **Filters (String)** parameter to filter the metadata using the [Supabase metadata query language](https://supabase.com/docs/guides/ai/python/metadata#metadata-query-language), inspired by the [MongoDB selectors](https://www.mongodb.com/docs/manual/reference/operator/query/) format. Access the metadata properties using the [Postgres `->>` arrow JSON operator](https://www.postgresql.org/docs/current/functions-json.html#FUNCTIONS-JSON-PROCESSING) like this (curly brackets denote components to fill in):
+
+```
+metadata->>{your-property}={comparison-operator}.{comparison-value}
+```
+
+For example to access an `age` property in the metadata and return results greater than or equal to 21, you could enter the following in the **Filters (String)** field:
+
+```
+metadata->>age=gte.21
+```
+
+You can combine these operators to construct more complex queries.
+
+## Can't connect to a local Supabase database when using Docker
+
+When you run Supabase in Docker, you need to configure the network so that n8n can connect to Supabase.
+
+The solution depends on how you're hosting the two components.
+
+### If only Supabase is in Docker
+
+If only Supabase is running in Docker, the Docker Compose file used by the [self-hosting guide](https://supabase.com/docs/guides/self-hosting/docker) already runs Supabase bound to the correct interfaces.
+
+When configuring [Supabase credentials](/integrations/builtin/credentials/supabase/), the `localhost` address should work without a problem (set the **Host** to `localhost`).
+
+### If Supabase and n8n are running in separate Docker containers
+
+If both n8n and Supabase are running in Docker in separate containers, you can use Docker networking to connect them.
+
+Configure Supabase to listen on all interfaces by binding to `0.0.0.0` inside of the container (the official [Docker compose configuration](https://supabase.com/docs/guides/self-hosting/docker) already does this this). Add both the Supabase and n8n components to the same [user-defined bridge network](https://docs.docker.com/engine/network/drivers/bridge/) if you aren't already managing them together in the same Docker Compose file.
+
+When configuring [Supabase credentials](/integrations/builtin/credentials/supabase/), use the Supabase API gateway container's name (`supabase-kong` by default) as the host address instead of `localhost`. For example, if you use the default configuration, you would set the **Host** to `http://supabase-kong:8000`.
+
+## Records are accessible through Postgres but not Supabase
+
+If queries for records return empty using the Supabase node, but are available through the [Postgres](/integrations/builtin/app-nodes/n8n-nodes-base.postgres/) node or with a Postgres client, there may be a conflict with Supabase's [Row Level Security (RLS)](https://supabase.com/docs/guides/database/postgres/row-level-security) policy.
+
+Supabase always enables RLS when you create a table in a public schema with the Table Editor. When RLS is active, the API doesn't return any data with the public `anon` key until you create policies. This is a security measure to ensure that you only expose data you intend to.
+
+To access data from a table with RLS enabled as the `anon` role, [create a policy](https://supabase.com/docs/guides/database/postgres/row-level-security#creating-policies) to enable the access patterns you intend to use.

docs/integrations/builtin/app-nodes/n8n-nodes-base.supabase/index.md

@@ -31,3 +31,7 @@ Refer to [Supabase credentials](/integrations/builtin/credentials/supabase/) for
 [[ templatesWidget(page.title, 'supabase') ]]
 
 --8<-- "_snippets/integrations/builtin/app-nodes/operation-not-supported.md"
+
+## Common issues
+
+For common errors or issues and suggested resolution steps, refer to [Common issues](/integrations/builtin/app-nodes/n8n-nodes-base.supabase/common-issues/).

mkdocs.yml

@@ -686,7 +686,9 @@ nav:
         - Strapi: integrations/builtin/app-nodes/n8n-nodes-base.strapi.md
         - Strava: integrations/builtin/app-nodes/n8n-nodes-base.strava.md
         - Stripe: integrations/builtin/app-nodes/n8n-nodes-base.stripe.md
-        - Supabase: integrations/builtin/app-nodes/n8n-nodes-base.supabase.md
+        - Supabase:
+          - Supabase: integrations/builtin/app-nodes/n8n-nodes-base.supabase/index.md
+          - Common issues: integrations/builtin/app-nodes/n8n-nodes-base.supabase/common-issues.md
         - SyncroMSP: integrations/builtin/app-nodes/n8n-nodes-base.syncromsp.md
         - Taiga: integrations/builtin/app-nodes/n8n-nodes-base.taiga.md
         - Tapfiliate: integrations/builtin/app-nodes/n8n-nodes-base.tapfiliate.md