billing: revert memory tier prices to pre-10x rates

docs/api-reference/sandboxes/create.mdx

@@ -14,11 +14,11 @@ Create a new sandbox.
 </ParamField>
 
 <ParamField body="cpuCount" type="integer">
-  CPU cores. Must match an allowed tier: `1`, `2`, `4`, `8`, or `16`. If omitted but `memoryMB` is set, inferred automatically.
+  CPU cores. Must match an allowed tier: `1`, `2`, or `4`. If omitted but `memoryMB` is set, inferred automatically.
 </ParamField>
 
 <ParamField body="memoryMB" type="integer">
-  Memory in MB. Must match an allowed tier: `1024`, `4096`, `8192`, `16384`, `32768`, or `65536`. If omitted but `cpuCount` is set, inferred automatically.
+  Memory in MB. Must match an allowed tier: `1024`, `4096`, `8192`, or `16384`. If omitted but `cpuCount` is set, inferred automatically.
 </ParamField>
 
 The allowed CPU/memory combinations are:
@@ -29,8 +29,6 @@ The allowed CPU/memory combinations are:
 | 4096 MB (4 GB) | 1 |
 | 8192 MB (8 GB) | 2 |
 | 16384 MB (16 GB) | 4 |
-| 32768 MB (32 GB) | 8 |
-| 65536 MB (64 GB) | 16 |
 
 The 1 GB tier provides 1 vCPU on a best-effort basis. For guaranteed CPU allocation, use the 4 GB tier or above.
 

docs/reference/typescript-sdk.mdx

@@ -33,8 +33,8 @@ Create a new sandbox.
 | `apiUrl` | string | env var | API URL |
 | `envs` | Record\<string, string\> | — | Environment variables |
 | `metadata` | Record\<string, string\> | — | Arbitrary metadata |
-| `cpuCount` | number | — | CPU cores (1, 2, 4, 8, or 16) |
-| `memoryMB` | number | — | Memory in MB (1024, 4096, 8192, 16384, 32768, or 65536) |
+| `cpuCount` | number | — | CPU cores (1, 2, or 4) |
+| `memoryMB` | number | — | Memory in MB (1024, 4096, 8192, or 16384) |
 | `image` | Image | — | Declarative image definition (see [Image](#image)) |
 | `snapshot` | string | — | Name of a pre-built snapshot |
 | `onBuildLog` | `(log: string) => void` | — | Build log callback (when using `image`) |

docs/sandboxes/elasticity.mdx

@@ -29,8 +29,6 @@ CPU is adjusted proportionally — you only need to specify memory. The permissi
 | 4GB | 1 |
 | 8GB | 2 |
 | 16GB | 4 |
-| 32GB | 8 |
-| 64GB | 16 |
 
 ## Check Current Limits
 

internal/billing/pricing.go

@@ -5,17 +5,17 @@ import (
 )
 
 // TierPricePerSecond maps memory_mb → USD per second.
-// Rates were 10×-ed on 2026-04-15 on top of the per-second correction that
-// landed earlier the same day. Existing paying orgs are grandfathered via
-// orgs.price_locked (see migration 022); cmd/migrate-prices skips locked orgs
-// by default so only new signups see these rates.
+// Reverted on 2026-04-22 back to the pre-10× rates established by the
+// per-second correction on 2026-04-15. Orgs that signed up at the 10× rate
+// between 2026-04-15 and 2026-04-22 are migrated onto these rates via
+// cmd/migrate-prices (price_locked=FALSE by default).
 var TierPricePerSecond = map[int]float64{
-	1024:  0.00001080246914, // 1GB / 1 vCPU
-	4096:  0.00005787037037, // 4GB / 1 vCPU
-	8192:  0.0001350308642,  // 8GB / 2 vCPU
-	16384: 0.0002700617284,  // 16GB / 4 vCPU
-	32768: 0.001929012346,   // 32GB / 8 vCPU
-	65536: 0.005401234568,   // 64GB / 16 vCPU
+	1024:  0.000001080246914, // 1GB / 1 vCPU
+	4096:  0.000005787037037, // 4GB / 1 vCPU
+	8192:  0.00001350308642,  // 8GB / 2 vCPU
+	16384: 0.00002700617284,  // 16GB / 4 vCPU
+	32768: 0.0001929012346,   // 32GB / 8 vCPU
+	65536: 0.0005401234568,   // 64GB / 16 vCPU
 }
 
 // TierMeterKey maps memory_mb → stable key used to derive the Stripe meter
@@ -37,18 +37,17 @@ var TierMeterKey = map[int]string{
 // must then be migrated to the new Price via cmd/migrate-prices — unless the
 // org is marked price_locked=TRUE, in which case they are grandfathered.
 //
-// The suffixes here are bumped one step above the per-second-correction set
-// (which established _v2 for most tiers and _v3 for 8GB). This forces
-// EnsureProducts to create fresh Prices at the 10×-higher rates below. Every
-// org currently paying is locked via migration 022, so migrate-prices skips
-// them by default — only new signups subscribe at the 10× rate.
+// The suffixes here are bumped one step above the 10× set (_v3 for most tiers,
+// _v4 for 8GB) to force EnsureProducts to create fresh Stripe Prices at the
+// reverted pre-10× rates below. Orgs still on the 10× Prices are moved onto
+// these new Prices via cmd/migrate-prices after deploy.
 var TierPriceKey = map[int]string{
-	1024:  "sandbox_1gb_v3",
-	4096:  "sandbox_4gb_v3",
-	8192:  "sandbox_8gb_v4",
-	16384: "sandbox_16gb_v3",
-	32768: "sandbox_32gb_v3",
-	65536: "sandbox_64gb_v3",
+	1024:  "sandbox_1gb_v4",
+	4096:  "sandbox_4gb_v4",
+	8192:  "sandbox_8gb_v5",
+	16384: "sandbox_16gb_v4",
+	32768: "sandbox_32gb_v4",
+	65536: "sandbox_64gb_v4",
 }
 
 // Disk overage billing — every GB above DiskFreeAllowanceMB is metered for the