collab: Record cancellation reason on billing subscriptions (#22853)

This PR updates the `billing_subscriptions` in the database to record
the cancellation reason from Stripe.

We're primarily interested in this so we can check for subscriptions
that were canceled for being `past_due`.

Release Notes:

- N/A

crates/collab/src/api/billing.rs

@@ -12,8 +12,8 @@ use serde::{Deserialize, Serialize};
 use serde_json::json;
 use std::{str::FromStr, sync::Arc, time::Duration};
 use stripe::{
-    BillingPortalSession, CreateBillingPortalSession, CreateBillingPortalSessionFlowData,
-    CreateBillingPortalSessionFlowDataAfterCompletion,
+    BillingPortalSession, CancellationDetailsReason, CreateBillingPortalSession,
+    CreateBillingPortalSessionFlowData, CreateBillingPortalSessionFlowDataAfterCompletion,
     CreateBillingPortalSessionFlowDataAfterCompletionRedirect,
     CreateBillingPortalSessionFlowDataType, CreateCustomer, Customer, CustomerId, EventObject,
     EventType, Expandable, ListEvents, Subscription, SubscriptionId, SubscriptionStatus,
@@ -21,8 +21,10 @@ use stripe::{
 use util::ResultExt;
 
 use crate::api::events::SnowflakeRow;
+use crate::db::billing_subscription::{StripeCancellationReason, StripeSubscriptionStatus};
 use crate::llm::{DEFAULT_MAX_MONTHLY_SPEND, FREE_TIER_MONTHLY_SPENDING_LIMIT};
 use crate::rpc::{ResultExt as _, Server};
+use crate::{db::UserId, llm::db::LlmDatabase};
 use crate::{
     db::{
         billing_customer, BillingSubscriptionId, CreateBillingCustomerParams,
@@ -32,10 +34,6 @@ use crate::{
     },
     stripe_billing::StripeBilling,
 };
-use crate::{
-    db::{billing_subscription::StripeSubscriptionStatus, UserId},
-    llm::db::LlmDatabase,
-};
 use crate::{AppState, Cents, Error, Result};
 
 pub fn router() -> Router {
@@ -679,6 +677,12 @@ async fn handle_customer_subscription_event(
                             .and_then(|cancel_at| DateTime::from_timestamp(cancel_at, 0))
                             .map(|time| time.naive_utc()),
                     ),
+                    stripe_cancellation_reason: ActiveValue::set(
+                        subscription
+                            .cancellation_details
+                            .and_then(|details| details.reason)
+                            .map(|reason| reason.into()),
+                    ),
                 },
             )
             .await?;
@@ -791,6 +795,16 @@ impl From<SubscriptionStatus> for StripeSubscriptionStatus {
     }
 }
 
+impl From<CancellationDetailsReason> for StripeCancellationReason {
+    fn from(value: CancellationDetailsReason) -> Self {
+        match value {
+            CancellationDetailsReason::CancellationRequested => Self::CancellationRequested,
+            CancellationDetailsReason::PaymentDisputed => Self::PaymentDisputed,
+            CancellationDetailsReason::PaymentFailed => Self::PaymentFailed,
+        }
+    }
+}
+
 /// Finds or creates a billing customer using the provided customer.
 async fn find_or_create_billing_customer(
     app: &Arc<AppState>,