Add Stripe subscription sync

backend/spec/models.md

@@ -22,10 +22,10 @@ Activity is an audit log of all actions performed by a user or a worker process.
   - `update_tenant`
   - `create_relay`
   - `update_relay`
-  - `update_relay_plan`
   - `activate_relay`
   - `deactivate_relay`
   - `fail_relay_sync`
+  - `complete_relay_sync`
 - `resource_type` is a string identifying the resource type being modified.
 - `resource_id` is a string identifying the resource id being modified.
 
@@ -35,16 +35,17 @@ A plan represents a rate charged for relays at a given feature/usage limit. Plan
 
 - `id` - the plan slug
 - `name` - the plan name
-- `sats` - the plan't cost per month
+- `amount` - the plan monthly cost in USD
 - `members` - the max number of members a relay can have before needing to upgrade. If empty, membership is not limited.
 - `blossom` - whether blossom media hosting is available on this plan
 - `livekit` - whether livekit audio/video calls are available on this plan
+- `stripe_price_id` - the identifier of the price in Stripe
 
 There are three plans available:
 
-- `free` - 0 sats/mo, up to 10 members, no blossom/livekit
-- `basic` - 10k sats/mo, up to 100 members, includes blossom/livekit
-- `growth` - 50k sats/mo, unlimited members, includes blossom/livekit
+- `free` - $0/mo, up to 10 members, no blossom/livekit
+- `basic` - $5/mo, up to 100 members, includes blossom/livekit
+- `growth` - $25/mo, unlimited members, includes blossom/livekit
 
 # Tenant
 
@@ -53,6 +54,8 @@ Tenants are customers of the service, identified by a nostr `pubkey`. Public met
 - `pubkey` is the nostr public key identifying the tenant
 - `nwc_url` (private) a nostr wallet connect URL used for **paying** invoices generated by the system
 - `created_at` unix timestamp identifying tenant creation time
+- `stripe_customer_id` a string identifying the associated stripe customer
+- `stripe_subscription_id` a string identifying the associated stripe subscription
 
 # Relay
 
@@ -63,6 +66,7 @@ A relay is a nostr relay owned by a `tenant` and hosted by the attached zooid in
 - `schema` - the relay's db schema (read_only, calculated based on `subdomain` + `id`)
 - `subdomain` - the relay's subdomain
 - `plan` - the relay's plan
+- `stripe_subscription_item_id` - the Stripe subscription item id.
 - `status` - `active|inactive`. Only `active` relays count toward billing.
 - `synced` - whether the relay has been successfully synced to zooid at least once.
 - `sync_error` - a string indicating any errors encountered when synchronizing.