perf: set global prisma transaction timeouts and reduce transaction scope (#2607)

Configure default transaction options (5s maxWait, 10s timeout) on the
PrismaClient instead of per-transaction overrides. Move side effects
like email sending, webhook triggers, and job dispatches out of
$transaction blocks to avoid holding database connections open during
network I/O.

Also extracts the direct template email into a background job and fixes
a bug where prisma was used instead of tx inside a transaction.

packages/trpc/server/admin-router/create-stripe-customer.ts

@@ -38,19 +38,19 @@ export const createStripeCustomerRoute = adminProcedure
       throw new AppError(AppErrorCode.NOT_FOUND);
     }
 
-    await prisma.$transaction(async (tx) => {
-      const stripeCustomer = await createCustomer({
-        name: organisation.name,
-        email: organisation.owner.email,
-      });
+    // Create Stripe customer outside a transaction to avoid holding a
+    // connection open during the external API call.
+    const stripeCustomer = await createCustomer({
+      name: organisation.name,
+      email: organisation.owner.email,
+    });
 
-      await tx.organisation.update({
-        where: {
-          id: organisationId,
-        },
-        data: {
-          customerId: stripeCustomer.id,
-        },
-      });
+    await prisma.organisation.update({
+      where: {
+        id: organisationId,
+      },
+      data: {
+        customerId: stripeCustomer.id,
+      },
     });
   });

packages/trpc/server/admin-router/update-subscription-claim.ts

@@ -29,24 +29,22 @@ export const updateSubscriptionClaimRoute = adminProcedure
 
     const newlyEnabledFlags = getNewTruthyFlags(existingClaim.flags, data.flags);
 
-    await prisma.$transaction(async (tx) => {
-      await tx.subscriptionClaim.update({
-        where: {
-          id,
-        },
-        data,
-      });
-
-      if (Object.keys(newlyEnabledFlags).length > 0) {
-        await jobsClient.triggerJob({
-          name: 'internal.backport-subscription-claims',
-          payload: {
-            subscriptionClaimId: id,
-            flags: newlyEnabledFlags,
-          },
-        });
-      }
+    await prisma.subscriptionClaim.update({
+      where: {
+        id,
+      },
+      data,
     });
+
+    if (Object.keys(newlyEnabledFlags).length > 0) {
+      await jobsClient.triggerJob({
+        name: 'internal.backport-subscription-claims',
+        payload: {
+          subscriptionClaimId: id,
+          flags: newlyEnabledFlags,
+        },
+      });
+    }
   });
 
 function getNewTruthyFlags(