add notes about tcp billing (#6957)

Author: nikolasburk

content/250-postgres/100-introduction/250-overview.mdx

@@ -22,7 +22,7 @@ Prisma Postgres charges for:
 - number of operations
 - storage (in GiB)
 
-An _operation_ is counted each time you perform a create, read, update, or delete, regardless of how simple or complex the underlying SQL is. Whether it's a single-row lookup or complex JOIN query, it still counts as one operation and costs the same. Read our blog post on [operations based billing](https://www.prisma.io/blog/operations-based-billing?utm_source=docs) for more details.
+An _operation_ is counted each time you perform a create, read, update, or delete, regardless of how simple or complex the underlying SQL is. Whether it's a single-row lookup or complex JOIN query, it still counts as one operation and costs the same. Read our blog post on [operations-based billing](https://www.prisma.io/blog/operations-based-billing?utm_source=docs) for more details.
 
 By treating every operation equally, you don't have to worry about write-heavy workloads driving up your bill or high-bandwidth requests ballooning costs unexpectedly. You can [directly correlate your database costs to real product usage and user behavior](/postgres/more/faq#is-there-a-sample-workload-to-estimate-my-expected-charges), making forecasting and budgeting simple and predictable.
 

content/250-postgres/1200-more/1000-faq.mdx

@@ -20,16 +20,14 @@ Yes, you can use Prisma Postgres with any database library or tool via a [direct
 
 If you previously signed up using GitHub and want to switch to email and password login, follow these steps:
 
-#### 1. Verify Your GitHub Email Address
-- Check the primary email address associated with your GitHub account (e.g., from your GitHub profile or notification settings).
-
-#### 2. Create a New Email/Password Account
-- Go to the email/password sign-up page.
-- Use the **same email address** linked to your GitHub account to create the new account.
-- Our system will automatically connect your new email/password account to your existing data.
-
-#### 3. Test Your Login
-- Log out and try logging in with your email and the password you just created.
+1. Verify Your GitHub Email Address
+    - Check the primary email address associated with your GitHub account (e.g., from your GitHub profile or notification settings).
+2. Create a New Email/Password Account
+    - Go to the email/password sign-up page.
+    - Use the _same email address_ linked to your GitHub account to create the new account.
+    - Our system will automatically connect your new email/password account to your existing data.
+3. Test Your Login
+    - Log out and try logging in with your email and the password you just created.
 
 :::note
 
@@ -50,21 +48,37 @@ VS Code should now recognize the `$extends` method.
 
 ## Pricing
 
-Prisma Postgres bills based on operations and storage consumed. Visit the [pricing page](https://www.prisma.io/pricing) for details and our [blog post explaining operations-based billing](https://www.prisma.io/blog/operations-based-billing) for a detailed explanation on what an operation is and how this pricing model works.
+Prisma Postgres bills based on _operations_ and _storage_ consumed. Visit the [pricing page](https://www.prisma.io/pricing) for details and our [blog post explaining operations-based billing](https://www.prisma.io/blog/operations-based-billing) for a detailed explanation on what an operation is and how this pricing model works.
+
+### What is an operation?
+
+An operation is counted each time you interact with your database. Read, write, simple or complex. It all simply counts as one. 
+
+An operation can be:
+- a Prisma ORM query (when using Prisma ORM)
+- a SQL query (when using a [direct TCP connection](/postgres/database/direct-connections))
 
 ### Does query execution time affect pricing in Prisma Postgres?
 
-No, cost for Prisma Postgres is based solely on the _number of operations_ (i.e. Prisma ORM queries), not the amount of compute required to execute them. 
+No, cost for Prisma Postgres is based solely on the _number of operations_, not the amount of compute required to execute them. 
 
 Whether a query takes 10ms or 10sec to execute, its pricing impact remains the same.
 
+### How does pricing differ between using Prisma ORM and direct TCP connections?
+
+The fundamental principle of operations-based pricing remains the same for Prisma ORM and [direct TCP connection](/postgres/database/direct-connections). However, depending on whether you use Prisma ORM or direct SQL to interact with your database, an operation is something different:
+- when using Prisma ORM: a query sent with Prisma Client (e.g. `prisma.user.findMany()`)
+- when using another tool: a SQL query sent via the direct connection (e.g. `SELECT * from "User"`)
+
+Note that a single Prisma ORM query may translate into multiple SQL queries which may make using Prisma ORM more economical than direct SQL.
+
 ### Do read and write queries cost the same?
 
 Yes, read and write queries are counted equally as _operations_ and are billed the same way.
 
 ### Does a `SELECT 1` query count as a billable operation?
 
-Yes, if submitted via Prisma ORM, a query like `SELECT 1` counts as an operation and will be billed accordingly (even if no actual data is accessed in the query).
+Yes, a query like `SELECT 1` counts as an operation and will be billed accordingly (even if no actual data is accessed in the query).
 
 ### How can I estimate the number of operations in Prisma ORM?
 

content/250-postgres/300-database/650-direct-connections.mdx

@@ -44,6 +44,10 @@ DATABASE_URL="postgres://2f9881cc7eef46f094ac913df34c1fb441502fe66cbe28cc48998d4
 
 SSL mode is required when connecting to Prisma Postgres via direct TCP, so you need to append `sslmode=require` to your TCP connection string.
 
+## Billing
+
+When using direct TCP to connect to a Prisma Postgres instance, every SQL query is counted as a [billable operation](/postgres/introduction/overview#usage-based-pricing). Learn more on our [pricing page](https://www.prisma.io/pricing).
+
 ## Temporary limitations
 
 ### Closing idle connections