collab: Rename symbols for existing Stripe synchronization (#29570)

This PR renames the symbols for the existing Stripe synchronization.

This will make things clearer once the new synchronization job for the
new billing is added.

Release Notes:

- N/A

crates/collab/src/api/billing.rs

@@ -1243,9 +1243,9 @@ async fn find_or_create_billing_customer(
     Ok(Some(billing_customer))
 }
 
-const SYNC_LLM_USAGE_WITH_STRIPE_INTERVAL: Duration = Duration::from_secs(60);
+const SYNC_LLM_TOKEN_USAGE_WITH_STRIPE_INTERVAL: Duration = Duration::from_secs(60);
 
-pub fn sync_llm_usage_with_stripe_periodically(app: Arc<AppState>) {
+pub fn sync_llm_token_usage_with_stripe_periodically(app: Arc<AppState>) {
     let Some(stripe_billing) = app.stripe_billing.clone() else {
         log::warn!("failed to retrieve Stripe billing object");
         return;
@@ -1260,17 +1260,19 @@ pub fn sync_llm_usage_with_stripe_periodically(app: Arc<AppState>) {
         let executor = executor.clone();
         async move {
             loop {
-                sync_with_stripe(&app, &llm_db, &stripe_billing)
+                sync_token_usage_with_stripe(&app, &llm_db, &stripe_billing)
                     .await
                     .context("failed to sync LLM usage to Stripe")
                     .trace_err();
-                executor.sleep(SYNC_LLM_USAGE_WITH_STRIPE_INTERVAL).await;
+                executor
+                    .sleep(SYNC_LLM_TOKEN_USAGE_WITH_STRIPE_INTERVAL)
+                    .await;
             }
         }
     });
 }
 
-async fn sync_with_stripe(
+async fn sync_token_usage_with_stripe(
     app: &Arc<AppState>,
     llm_db: &Arc<LlmDatabase>,
     stripe_billing: &Arc<StripeBilling>,
@@ -1306,7 +1308,7 @@ async fn sync_with_stripe(
             .subscribe_to_model(&stripe_subscription_id, &stripe_model)
             .await?;
         stripe_billing
-            .bill_model_usage(&stripe_customer_id, &stripe_model, &event)
+            .bill_model_token_usage(&stripe_customer_id, &stripe_model, &event)
             .await?;
         llm_db.consume_billing_event(event.id).await?;
     }

crates/collab/src/main.rs

@@ -8,7 +8,7 @@ use axum::{
 };
 
 use collab::api::CloudflareIpCountryHeader;
-use collab::api::billing::sync_llm_usage_with_stripe_periodically;
+use collab::api::billing::sync_llm_token_usage_with_stripe_periodically;
 use collab::llm::db::LlmDatabase;
 use collab::migrations::run_database_migrations;
 use collab::user_backfiller::spawn_user_backfiller;
@@ -152,7 +152,7 @@ async fn main() -> Result<()> {
 
                     if let Some(mut llm_db) = llm_db {
                         llm_db.initialize().await?;
-                        sync_llm_usage_with_stripe_periodically(state.clone());
+                        sync_llm_token_usage_with_stripe_periodically(state.clone());
                     }
 
                     app = app

crates/collab/src/stripe_billing.rs

@@ -268,7 +268,7 @@ impl StripeBilling {
         Ok(())
     }
 
-    pub async fn bill_model_usage(
+    pub async fn bill_model_token_usage(
         &self,
         customer_id: &stripe::CustomerId,
         model: &StripeModel,