[PORTALDB] Enhancing to include SVGs for sharing across applications (#450)

## Summary

Adds SVG storage to the DB so all apps referencing Portal DB can have
the same assets.

### Primary Changes:

- Adds a column to `services` that stores the SVG code for each service.
- Improves documentation of the DB

## Type of change

Select one or more from the following:

- [x] New feature, functionality or library
- [ ] Bug fix
- [ ] Code health or cleanup
- [x] Documentation
- [ ] Other (specify)

Author: fredteumer

portal-db/init/001_schema.sql

@@ -7,6 +7,7 @@
 -- ============================================================================
 
 -- Designates the API Types that we support. We can expand this should new interfaces be introduced.
+-- Also used as a mapping for the types of QoS that should be attached to a service.
 CREATE TYPE endpoint_type AS ENUM ('cometBFT', 'cosmos', 'REST', 'JSON-RPC', 'WSS', 'gRPC');
 
 -- Creates intervals that plans can be evaluated on, also enables users to set their plan limits
@@ -269,6 +270,7 @@ CREATE TABLE services (
     active BOOLEAN DEFAULT FALSE,
     quality_fallback_enabled BOOLEAN DEFAULT FALSE,
     hard_fallback_enabled BOOLEAN DEFAULT FALSE,
+    svg_icon TEXT, 
     deleted_at TIMESTAMPTZ,
     created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
     updated_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
@@ -432,4 +434,4 @@ CREATE INDEX idx_portal_accounts_stripe ON portal_accounts(stripe_subscription_i
   WHERE stripe_subscription_id IS NOT NULL;
 CREATE INDEX idx_services_active ON services(service_id) WHERE active = TRUE AND deleted_at IS NULL;
 CREATE INDEX idx_portal_applications_active ON portal_applications(portal_account_id)
-  WHERE deleted_at IS NULL;
+  WHERE deleted_at IS NULL;