diff --git a/docs/api-integration.md b/docs/api-integration.md
index 0fcebe1..030411b 100644
--- a/docs/api-integration.md
+++ b/docs/api-integration.md
@@ -92,6 +92,28 @@ type TopAgents = { serviceId: string; items: { agent: string; total: number }[]
 > (e.g. `"1e2"`), and whitespace-padded input. The accepted range is shown as a field
 > hint on both the create (`services/new`) and edit (`services/[serviceId]/edit`) forms.
 
+### Optimistic service price mutations
+
+Price edits use the service-scoped optimistic ledger in
+[`src/lib/serviceOptimisticStore.ts`](../src/lib/serviceOptimisticStore.ts).
+The edited price is published to subscribed dashboard/detail consumers before the
+PATCH resolves. Each service has an independent monotonic mutation revision and
+network queue: same-service PATCH + reconciliation pairs execute in submit order,
+so an older write cannot land after a newer one and leave server state behind the
+newer UI. Queues are independent across services, so unrelated updates still run
+concurrently.
+
+A successful PATCH is followed by a canonical
+`GET /api/v1/services/{serviceId}`; that response reconciles the optimistic
+entry. If the write fails, only that mutation revision is removed, revealing the
+exact previous canonical value (or the next-newest pending edit). Write failures
+surface the stable `SERVICE_WRITE_FAILED` code with a user-safe message, and
+the edit form announces the rollback through an `aria-live="polite"` status
+region. A write that succeeds but cannot be reconciled is distinguished as
+`SERVICE_RECONCILE_FAILED`; the optimistic value is retained because the
+server write already succeeded.
+
+
 ## Usage
 
 | Method & path | Type | Request body | Response shape | Source |
diff --git a/package-lock.json b/package-lock.json
index 17617f3..b523aa7 100644
--- a/package-lock.json
+++ b/package-lock.json
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-        "@emnapi/runtime": "^1.7.1 || ^2.0.0-alpha.4"
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+        "@emnapi/runtime": "^1.7.1"
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@@ -3177,9 +3172,9 @@
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@@ -3191,18 +3186,9 @@
         "redent": "^3.0.0"
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-        "node": ">=22",
+        "node": ">=14",
         "npm": ">=6",
         "yarn": ">=1"
-      },
-      "peerDependencies": {
-        "@testing-library/dom": ">=10 <11",
-        "vitest": ">= 0.32"
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@@ -3345,13 +3331,6 @@
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@@ -3579,6 +3558,19 @@
         "url": "https://opencollective.com/typescript-eslint"
       }
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+      "dev": true,
+      "license": "Apache-2.0",
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+      },
+      "funding": {
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@@ -3685,9 +3677,6 @@
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@@ -3702,9 +3691,6 @@
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@@ -3719,9 +3705,6 @@
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@@ -3736,9 +3719,6 @@
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@@ -3753,9 +3733,6 @@
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@@ -3770,9 +3747,6 @@
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@@ -3787,9 +3761,6 @@
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@@ -3821,9 +3789,6 @@
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@@ -3838,9 +3803,6 @@
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       "optional": true,
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@@ -4059,6 +4021,13 @@
       "dev": true,
       "license": "MIT"
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+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
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+      "dev": true,
+      "license": "Python-2.0"
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+      "resolved": "https://registry.npmjs.org/axe-core/-/axe-core-4.12.1.tgz",
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-        "@eslint/core": "^1.2.1",
-        "@eslint/plugin-kit": "^0.7.2",
+        "@eslint-community/regexpp": "^4.12.1",
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+        "@eslint/config-helpers": "^0.4.2",
+        "@eslint/core": "^0.17.0",
+        "@eslint/eslintrc": "^3.3.6",
+        "@eslint/js": "9.39.5",
+        "@eslint/plugin-kit": "^0.4.1",
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         "@types/estree": "^1.0.6",
         "ajv": "^6.14.0",
+        "chalk": "^4.0.0",
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-        "eslint-visitor-keys": "^5.0.1",
-        "espree": "^11.2.0",
-        "esquery": "^1.7.0",
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+        "eslint-visitor-keys": "^4.2.1",
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@@ -5364,7 +5333,8 @@
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@@ -5372,7 +5342,7 @@
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+        "doctrine": "^2.1.0",
+        "eslint-import-resolver-node": "^0.3.9",
+        "eslint-module-utils": "^2.12.1",
+        "hasown": "^2.0.2",
+        "is-core-module": "^2.16.1",
+        "is-glob": "^4.0.3",
+        "minimatch": "^3.1.2",
+        "object.fromentries": "^2.0.8",
+        "object.groupby": "^1.0.3",
+        "object.values": "^1.2.1",
+        "semver": "^6.3.1",
+        "string.prototype.trimend": "^1.0.9",
+        "tsconfig-paths": "^3.15.0"
+      },
+      "engines": {
+        "node": ">=4"
+      },
+      "peerDependencies": {
+        "eslint": "^2 || ^3 || ^4 || ^5 || ^6 || ^7.2.0 || ^8 || ^9"
+      }
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+    "node_modules/eslint-plugin-import/node_modules/debug": {
+      "version": "3.2.7",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.7.tgz",
+      "integrity": "sha512-CFjzYYAi4ThfiQvizrFQevTTXHtnCqWfe7x1AhgEscTz6ZbLbfoLRLPugTQyBth6f8ZERVUSyWHFD/7Wu4t1XQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ms": "^2.1.1"
+      }
+    },
+    "node_modules/eslint-plugin-jsx-a11y": {
+      "version": "6.10.2",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-jsx-a11y/-/eslint-plugin-jsx-a11y-6.10.2.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "aria-query": "^5.3.2",
+        "array-includes": "^3.1.8",
+        "array.prototype.flatmap": "^1.3.2",
+        "ast-types-flow": "^0.0.8",
+        "axe-core": "^4.10.0",
+        "axobject-query": "^4.1.0",
+        "damerau-levenshtein": "^1.0.8",
+        "emoji-regex": "^9.2.2",
+        "hasown": "^2.0.2",
+        "jsx-ast-utils": "^3.3.5",
+        "language-tags": "^1.0.9",
+        "minimatch": "^3.1.2",
+        "object.fromentries": "^2.0.8",
+        "safe-regex-test": "^1.0.3",
+        "string.prototype.includes": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=4.0"
+      },
+      "peerDependencies": {
+        "eslint": "^3 || ^4 || ^5 || ^6 || ^7 || ^8 || ^9"
+      }
+    },
+    "node_modules/eslint-plugin-jsx-a11y/node_modules/aria-query": {
+      "version": "5.3.2",
+      "resolved": "https://registry.npmjs.org/aria-query/-/aria-query-5.3.2.tgz",
+      "integrity": "sha512-COROpnaoap1E2F000S62r6A60uHZnmlvomhfyT2DlTcrY1OrBKn2UhH7qn5wTC9zMvD0AY7csdPSNwKP+7WiQw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
+    "node_modules/eslint-plugin-react": {
+      "version": "7.37.5",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-react/-/eslint-plugin-react-7.37.5.tgz",
+      "integrity": "sha512-Qteup0SqU15kdocexFNAJMvCJEfa2xUKNV4CC1xsVMrIIqEy3SQ/rqyxCWNzfrd3/ldy6HMlD2e0JDVpDg2qIA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "array-includes": "^3.1.8",
+        "array.prototype.findlast": "^1.2.5",
+        "array.prototype.flatmap": "^1.3.3",
+        "array.prototype.tosorted": "^1.1.4",
+        "doctrine": "^2.1.0",
+        "es-iterator-helpers": "^1.2.1",
+        "estraverse": "^5.3.0",
+        "hasown": "^2.0.2",
+        "jsx-ast-utils": "^2.4.1 || ^3.0.0",
+        "minimatch": "^3.1.2",
+        "object.entries": "^1.1.9",
+        "object.fromentries": "^2.0.8",
+        "object.values": "^1.2.1",
+        "prop-types": "^15.8.1",
+        "resolve": "^2.0.0-next.5",
+        "semver": "^6.3.1",
+        "string.prototype.matchall": "^4.0.12",
+        "string.prototype.repeat": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=4"
+      },
+      "peerDependencies": {
+        "eslint": "^3 || ^4 || ^5 || ^6 || ^7 || ^8 || ^9.7"
+      }
+    },
     "node_modules/eslint-plugin-react-hooks": {
       "version": "7.1.1",
       "resolved": "https://registry.npmjs.org/eslint-plugin-react-hooks/-/eslint-plugin-react-hooks-7.1.1.tgz",
@@ -6018,89 +5875,48 @@
       }
     },
     "node_modules/eslint-scope": {
-      "version": "9.1.2",
-      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-9.1.2.tgz",
-      "integrity": "sha512-xS90H51cKw0jltxmvmHy2Iai1LIqrfbw57b79w/J7MfvDfkIkFZ+kj6zC3BjtUwh150HsSSdxXZcsuv72miDFQ==",
+      "version": "8.4.0",
+      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-8.4.0.tgz",
+      "integrity": "sha512-sNXOfKCn74rt8RICKMvJS7XKV/Xk9kA7DyJr8mJik3S7Cwgy3qlkkmyS2uQB3jiJg6VNdZd/pDBJu0nvG2NlTg==",
       "dev": true,
       "license": "BSD-2-Clause",
       "dependencies": {
-        "@types/esrecurse": "^4.3.1",
-        "@types/estree": "^1.0.8",
         "esrecurse": "^4.3.0",
         "estraverse": "^5.2.0"
       },
       "engines": {
-        "node": "^20.19.0 || ^22.13.0 || >=24"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
         "url": "https://opencollective.com/eslint"
       }
     },
     "node_modules/eslint-visitor-keys": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-5.0.1.tgz",
-      "integrity": "sha512-tD40eHxA35h0PEIZNeIjkHoDR4YjjJp34biM0mDvplBe//mB+IHCqHDGV7pxF+7MklTvighcCPPZC7ynWyjdTA==",
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-4.2.1.tgz",
+      "integrity": "sha512-Uhdk5sfqcee/9H/rCOJikYz67o0a2Tw2hGRPOG2Y1R2dg7brRe1uG0yaNQDHu+TO/uQPF/5eCapvYSmHUjt7JQ==",
       "dev": true,
       "license": "Apache-2.0",
       "engines": {
-        "node": "^20.19.0 || ^22.13.0 || >=24"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
         "url": "https://opencollective.com/eslint"
       }
     },
-    "node_modules/eslint/node_modules/balanced-match": {
-      "version": "4.0.4",
-      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-4.0.4.tgz",
-      "integrity": "sha512-BLrgEcRTwX2o6gGxGOCNyMvGSp35YofuYzw9h1IMTRmKqttAZZVU67bdb9Pr2vUHA8+j3i2tJfjO6C6+4myGTA==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": "18 || 20 || >=22"
-      }
-    },
-    "node_modules/eslint/node_modules/brace-expansion": {
-      "version": "5.0.9",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.9.tgz",
-      "integrity": "sha512-ScQ4IuvIEF1TMlP7Zt+vjJ//9zlPb2SDcxWxM3bk8s6t6GGdJ7KO1dCcTidOPJKePW30LE/2cT7wCyPho9/Wxg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "balanced-match": "^4.0.2"
-      },
-      "engines": {
-        "node": "20 || >=22"
-      }
-    },
-    "node_modules/eslint/node_modules/minimatch": {
-      "version": "10.2.6",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-10.2.6.tgz",
-      "integrity": "sha512-vpLQEs+VLCr1nU0BXS07maYoFwlDAH0gngQuuttxIwutDFEMHq2blX+8vpgxDdK3J1PwjCJiep77OitTZ4Ll1A==",
-      "dev": true,
-      "license": "BlueOak-1.0.0",
-      "dependencies": {
-        "brace-expansion": "^5.0.8"
-      },
-      "engines": {
-        "node": "18 || 20 || >=22"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
     "node_modules/espree": {
-      "version": "11.2.0",
-      "resolved": "https://registry.npmjs.org/espree/-/espree-11.2.0.tgz",
-      "integrity": "sha512-7p3DrVEIopW1B1avAGLuCSh1jubc01H2JHc8B4qqGblmg5gI9yumBgACjWo4JlIc04ufug4xJ3SQI8HkS/Rgzw==",
+      "version": "10.4.0",
+      "resolved": "https://registry.npmjs.org/espree/-/espree-10.4.0.tgz",
+      "integrity": "sha512-j6PAQ2uUr79PZhBjP5C5fhl8e39FmRnOjsD5lGnWrFU8i2G776tBK7+nP8KuQUTTyAZUwfQqXAgrVH5MbH9CYQ==",
       "dev": true,
       "license": "BSD-2-Clause",
       "dependencies": {
-        "acorn": "^8.16.0",
+        "acorn": "^8.15.0",
         "acorn-jsx": "^5.3.2",
-        "eslint-visitor-keys": "^5.0.1"
+        "eslint-visitor-keys": "^4.2.1"
       },
       "engines": {
-        "node": "^20.19.0 || ^22.13.0 || >=24"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "funding": {
         "url": "https://opencollective.com/eslint"
@@ -6543,9 +6359,9 @@
       }
     },
     "node_modules/get-tsconfig": {
-      "version": "4.14.3",
-      "resolved": "https://registry.npmjs.org/get-tsconfig/-/get-tsconfig-4.14.3.tgz",
-      "integrity": "sha512-++QEw4DIY7WGoukz+/+A/8dGYPT9l9yIadnmSgZ8Rjr3YVSVDipQSO9CdnJo9ePqFqUUqh+wk9uIaoiAwsiPkA==",
+      "version": "4.14.0",
+      "resolved": "https://registry.npmjs.org/get-tsconfig/-/get-tsconfig-4.14.0.tgz",
+      "integrity": "sha512-yTb+8DXzDREzgvYmh6s9vHsSVCHeC0G3PI5bEXNBHtmshPnO+S5O7qgLEOn0I5QvMy6kpZN8K1NKGyilLb93wA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -6590,6 +6406,19 @@
         "node": ">=10.13.0"
       }
     },
+    "node_modules/globals": {
+      "version": "14.0.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
+      "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/globalthis": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/globalthis/-/globalthis-1.0.4.tgz",
@@ -6841,6 +6670,23 @@
         "node": ">= 4"
       }
     },
+    "node_modules/import-fresh": {
+      "version": "3.3.1",
+      "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.3.1.tgz",
+      "integrity": "sha512-TR3KfrTZTYLPB6jUjfx6MF9WcWrHL9su5TObK4ZkYgBdWKPOFoSoQIdEuTuR82pmtxH2spWG9h6etwfr1pLBqQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "parent-module": "^1.0.0",
+        "resolve-from": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/import-local": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/import-local/-/import-local-3.2.0.tgz",
@@ -8678,6 +8524,29 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/js-yaml": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.3.0.tgz",
+      "integrity": "sha512-1td788aAnnZ5qs7V2QIRl1owjtYpbKt749Y3xauqQgwIIGF/xXWz1wMTEBx5O3LK3lXLVuqXPdPxj2BoFHaW9Q==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/puzrin"
+        },
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/nodeca"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "argparse": "^2.0.1"
+      },
+      "bin": {
+        "js-yaml": "bin/js-yaml.js"
+      }
+    },
     "node_modules/jsdom": {
       "version": "26.1.0",
       "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-26.1.0.tgz",
@@ -9131,6 +9000,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/lodash.merge": {
+      "version": "4.6.2",
+      "resolved": "https://registry.npmjs.org/lodash.merge/-/lodash.merge-4.6.2.tgz",
+      "integrity": "sha512-0KpjqXRVvrYyCsX1swR/XTK0va6VQkQM6MNo7PqW77ByjAhoARA8EfrP1N4+KlKj8YS0ZUCtRT/YUuhyYDujIQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/loose-envify": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/loose-envify/-/loose-envify-1.4.0.tgz",
@@ -9706,6 +9582,19 @@
         "node": ">=6"
       }
     },
+    "node_modules/parent-module": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/parent-module/-/parent-module-1.0.1.tgz",
+      "integrity": "sha512-GQ2EWRpQV8/o+Aw8YqtfZZPfNRWZYkbidE9k5rpl/hC3vtHHBfGm2Ifi6qWV+coDGkrUKZAxE3Lot5kcsRlh+g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "callsites": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/parse-json": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-5.2.0.tgz",
@@ -10189,6 +10078,16 @@
         "node": ">=8"
       }
     },
+    "node_modules/resolve-from": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",
+      "integrity": "sha512-pb/MYmXstAkysRFx8piNI1tGFNQIFA3vkE3Gq4EuA1dF6gHp/+vgZqsCGJapvy8N3Q+4o7FwvquPJcnZ7RYy4g==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/resolve-pkg-maps": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/resolve-pkg-maps/-/resolve-pkg-maps-1.0.0.tgz",
diff --git a/src/app/services/[serviceId]/edit/page.test.tsx b/src/app/services/[serviceId]/edit/page.test.tsx
index eacc6e6..04c7410 100644
--- a/src/app/services/[serviceId]/edit/page.test.tsx
+++ b/src/app/services/[serviceId]/edit/page.test.tsx
@@ -1,7 +1,11 @@
-import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { act, fireEvent, render, screen, waitFor } from "@testing-library/react";
 import EditServicePage from "./page";
 import { apiGet, apiPatch } from "@/lib/apiClient";
 import { ToastProvider } from "@/components/ToastProvider";
+import {
+  __resetServiceOptimisticStoreForTests,
+  getOptimisticService,
+} from "@/lib/serviceOptimisticStore";
 
 jest.mock("@/lib/apiClient", () => ({
   apiGet: jest.fn(),
@@ -32,6 +36,16 @@ jest.mock("next/navigation", () => ({
 const mockApiGet = apiGet as jest.MockedFunction<typeof apiGet>;
 const mockApiPatch = apiPatch as jest.MockedFunction<typeof apiPatch>;
 
+function deferred<T>() {
+  let resolve!: (value: T | PromiseLike<T>) => void;
+  let reject!: (reason?: unknown) => void;
+  const promise = new Promise<T>((resolvePromise, rejectPromise) => {
+    resolve = resolvePromise;
+    reject = rejectPromise;
+  });
+  return { promise, resolve, reject };
+}
+
 function renderPage(serviceId: string) {
   const params = Promise.resolve({ serviceId }) as Promise<{
     serviceId: string;
@@ -48,6 +62,7 @@ describe("EditServicePage", () => {
     mockApiGet.mockReset();
     mockApiPatch.mockReset();
     mockPush.mockReset();
+    __resetServiceOptimisticStoreForTests();
   });
 
   afterEach(() => {
@@ -215,10 +230,15 @@ describe("EditServicePage", () => {
   // ── Submit: success ───────────────────────────────────────────
 
   it("calls PATCH, shows success toast, clears dirty, and redirects on valid submit", async () => {
-    mockApiGet.mockResolvedValueOnce({
-      serviceId: "svc-1",
-      priceStroops: 1000,
-    } as never);
+    mockApiGet
+      .mockResolvedValueOnce({
+        serviceId: "svc-1",
+        priceStroops: 1000,
+      } as never)
+      .mockResolvedValueOnce({
+        serviceId: "svc-1",
+        priceStroops: 2100,
+      } as never);
     mockApiPatch.mockResolvedValueOnce({} as never);
     renderPage("svc-1");
     const input = await screen.findByLabelText("Price (stroops / request)");
@@ -247,19 +267,82 @@ describe("EditServicePage", () => {
 
   // ── Submit: failure ───────────────────────────────────────────
 
-  it("surfaces PATCH failures as a role=alert", async () => {
+  it("serializes rapid edits and rolls a failed newer edit back to the first canonical result", async () => {
+    const firstWrite = deferred<void>();
+
+    mockApiGet
+      .mockResolvedValueOnce({
+        serviceId: "svc-1",
+        priceStroops: 1000,
+      } as never)
+      .mockResolvedValueOnce({
+        serviceId: "svc-1",
+        priceStroops: 2250,
+      } as never);
+    mockApiPatch
+      .mockReturnValueOnce(firstWrite.promise as never)
+      .mockRejectedValueOnce(new Error("newer edit failed"));
+
+    renderPage("svc-1");
+    const input = await screen.findByLabelText("Price (stroops / request)");
+
+    fireEvent.change(input, { target: { value: "2000" } });
+    fireEvent.submit(screen.getByRole("button"));
+
+    await waitFor(() => {
+      expect(mockApiPatch).toHaveBeenCalledTimes(1);
+      expect(getOptimisticService("svc-1")?.priceStroops).toBe(2000);
+    });
+
+    fireEvent.change(input, { target: { value: "3000" } });
+    fireEvent.submit(screen.getByRole("button"));
+
+    await waitFor(() => {
+      expect(getOptimisticService("svc-1")?.priceStroops).toBe(3000);
+    });
+    expect(mockApiPatch).toHaveBeenCalledTimes(1);
+    expect(input).toHaveValue("3000");
+
+    await act(async () => {
+      firstWrite.resolve();
+      await firstWrite.promise;
+    });
+
+    await waitFor(() => {
+      expect(mockApiPatch).toHaveBeenCalledTimes(2);
+      expect(getOptimisticService("svc-1")?.priceStroops).toBe(2250);
+      expect(input).toHaveValue("2250");
+    });
+
+    expect(mockPush).not.toHaveBeenCalled();
+  });
+
+  it("rolls back failed PATCH state and announces a safe message politely", async () => {
     mockApiGet.mockResolvedValueOnce({
       serviceId: "svc-1",
       priceStroops: 1000,
     } as never);
-    mockApiPatch.mockRejectedValueOnce(new Error("Price too high"));
+    mockApiPatch.mockRejectedValueOnce(
+      new Error("database table internals must stay private"),
+    );
     renderPage("svc-1");
     const input = await screen.findByLabelText("Price (stroops / request)");
     fireEvent.change(input, { target: { value: "2000" } });
 
     fireEvent.submit(screen.getByRole("button", { name: "Save" }));
 
-    const alert = await screen.findByRole("alert");
-    expect(alert).toHaveTextContent("Price too high");
+    await waitFor(() => {
+      expect(getOptimisticService("svc-1")?.priceStroops).toBe(1000);
+    });
+
+    const liveRegion = await screen.findByRole("status");
+    expect(liveRegion).toHaveAttribute("aria-live", "polite");
+    expect(liveRegion).toHaveTextContent(
+      "Could not update the service. Your previous price was restored.",
+    );
+    expect(input).toHaveValue("1000");
+    expect(
+      screen.queryByText("database table internals must stay private"),
+    ).not.toBeInTheDocument();
   });
 });
diff --git a/src/app/services/[serviceId]/edit/page.tsx b/src/app/services/[serviceId]/edit/page.tsx
index 5765018..971fe6f 100644
--- a/src/app/services/[serviceId]/edit/page.tsx
+++ b/src/app/services/[serviceId]/edit/page.tsx
@@ -1,17 +1,27 @@
 "use client";
 
-import { useEffect, useState, use } from "react";
+import { useEffect, useRef, useState, use } from "react";
 import { useRouter } from "next/navigation";
 import Link from "next/link";
 import { apiGet, apiPatch } from "@/lib/apiClient";
-import { PageShell } from "@/components/PageShell";
 import { TextField } from "@/components/TextField";
 import { Spinner } from "@/components/Spinner";
 import { useToast } from "@/components/ToastProvider";
 import { parseNonNegativeInt } from "@/lib/validateNumber";
+import {
+  getOptimisticService,
+  hydrateServiceSnapshot,
+  runOptimisticServiceMutation,
+  ServiceMutationError,
+} from "@/lib/serviceOptimisticStore";
 
 type Service = { serviceId: string; priceStroops: number };
 
+const UPDATE_FAILURE_MESSAGE =
+  "Could not update the service. Your previous price was restored.";
+const RECONCILE_FAILURE_MESSAGE =
+  "The price was saved, but the latest server value could not be confirmed. Refresh before editing again.";
+
 export default function EditServicePage({
   params,
 }: {
@@ -22,31 +32,38 @@ export default function EditServicePage({
   const toast = useToast();
   const [price, setPrice] = useState("");
   const [error, setError] = useState<string | null>(null);
-  const [saving, setSaving] = useState(false);
+  const [announcement, setAnnouncement] = useState("");
+  const [pendingSaves, setPendingSaves] = useState(0);
   const [prefillLoading, setPrefillLoading] = useState(true);
   const [prefillError, setPrefillError] = useState<string | null>(null);
   const [originalPrice, setOriginalPrice] = useState<string | null>(null);
+  const [serverService, setServerService] = useState<Service | null>(null);
+  const submitGenerationRef = useRef(0);
+  const dirtyRef = useRef(false);
+  const pendingSavesRef = useRef(0);
 
-  /**
-   * Whether the price field differs from the originally-fetched value.
-   * Derived during render (not stored in state) so it stays in sync without a
-   * setState-in-effect. Used by the unsaved-changes guard.
-   */
   const dirty = originalPrice !== null && price !== originalPrice;
+  const saving = pendingSaves > 0;
 
   useEffect(() => {
     const load = async () => {
       setPrefillLoading(true);
       setPrefillError(null);
       try {
-        const s = await apiGet<Service>(
-          `/api/v1/services/${encodeURIComponent(serviceId)}`,
+        const service = await apiGet<Service>(
+          "/api/v1/services/" + encodeURIComponent(serviceId),
         );
-        const prefilled = String(s.priceStroops);
+        const prefilled = String(service.priceStroops);
+        setServerService(service);
+        hydrateServiceSnapshot(service);
         setPrice(prefilled);
         setOriginalPrice(prefilled);
-      } catch (e) {
-        setPrefillError((e as Error).message);
+      } catch (loadError) {
+        setPrefillError(
+          loadError instanceof Error
+            ? loadError.message
+            : "Failed to load service details.",
+        );
       } finally {
         setPrefillLoading(false);
       }
@@ -54,49 +71,118 @@ export default function EditServicePage({
     void load();
   }, [serviceId]);
 
-  /*
-   * beforeunload guard: registers a `beforeunload` event on the window
-   * whenever the form is dirty so the browser prompts the operator before
-   * closing or navigating away.
-   */
   useEffect(() => {
+    dirtyRef.current = dirty;
     if (!dirty) return;
 
-    const handler = (e: BeforeUnloadEvent) => {
-      e.preventDefault();
+    const handler = (event: BeforeUnloadEvent) => {
+      if (dirtyRef.current) {
+        event.preventDefault();
+      }
     };
     window.addEventListener("beforeunload", handler);
     return () => window.removeEventListener("beforeunload", handler);
   }, [dirty]);
 
-  const handleBack = (e: React.MouseEvent<HTMLAnchorElement>) => {
-    if (dirty && !window.confirm("You have unsaved changes. Are you sure you want to leave?")) {
-      e.preventDefault();
+  const handleBack = (event: React.MouseEvent<HTMLAnchorElement>) => {
+    if (
+      dirty &&
+      !window.confirm("You have unsaved changes. Are you sure you want to leave?")
+    ) {
+      event.preventDefault();
     }
   };
 
-  const onSubmit = async (e: React.FormEvent) => {
-    e.preventDefault();
+  const onSubmit = async (event: React.FormEvent) => {
+    event.preventDefault();
     setError(null);
+    setAnnouncement("");
+
     const parsed = parseNonNegativeInt(price);
     if (!parsed.ok) {
       setError(parsed.message);
       return;
     }
 
-    setSaving(true);
+    const current =
+      getOptimisticService(serviceId) ??
+      serverService ?? {
+        serviceId,
+        priceStroops:
+          originalPrice === null ? parsed.value : Number(originalPrice),
+      };
+    const optimistic: Service = {
+      ...current,
+      serviceId,
+      priceStroops: parsed.value,
+    };
+    const submission = ++submitGenerationRef.current;
+
+    pendingSavesRef.current += 1;
+    setPendingSaves(pendingSavesRef.current);
+
     try {
-      await apiPatch(
-        `/api/v1/services/${encodeURIComponent(serviceId)}/price`,
-        { priceStroops: parsed.value }
-      );
-      setOriginalPrice(price);
+      const canonical = await runOptimisticServiceMutation({
+        serviceId,
+        current,
+        optimistic,
+        mutate: () =>
+          apiPatch(
+            "/api/v1/services/" + encodeURIComponent(serviceId) + "/price",
+            { priceStroops: parsed.value },
+          ),
+        reconcile: () =>
+          apiGet<Service>("/api/v1/services/" + encodeURIComponent(serviceId)),
+        failureMessage: UPDATE_FAILURE_MESSAGE,
+        reconcileMessage: RECONCILE_FAILURE_MESSAGE,
+      });
+
+      if (submission !== submitGenerationRef.current) {
+        return;
+      }
+
+      dirtyRef.current = false;
+      const canonicalPrice = String(canonical.priceStroops);
+      setServerService(canonical);
+      setPrice(canonicalPrice);
+      setOriginalPrice(canonicalPrice);
       toast.push("Price updated.", "info");
-      router.push(`/services/${encodeURIComponent(serviceId)}`);
-    } catch (err) {
-      setError((err as Error).message);
+      router.push("/services/" + encodeURIComponent(serviceId));
+    } catch (mutationError) {
+      if (submission !== submitGenerationRef.current) {
+        return;
+      }
+
+      const message =
+        mutationError instanceof ServiceMutationError
+          ? mutationError.message
+          : UPDATE_FAILURE_MESSAGE;
+      const rolledBack = getOptimisticService(serviceId);
+
+      if (rolledBack) {
+        dirtyRef.current = false;
+        const rolledBackPrice = String(rolledBack.priceStroops);
+        setServerService(rolledBack);
+        setPrice(rolledBackPrice);
+        setOriginalPrice(rolledBackPrice);
+      }
+
+      setError(message);
+      setAnnouncement(message);
     } finally {
-      setSaving(false);
+      pendingSavesRef.current = Math.max(0, pendingSavesRef.current - 1);
+      setPendingSaves(pendingSavesRef.current);
+
+      if (pendingSavesRef.current === 0) {
+        const settled = getOptimisticService(serviceId);
+        if (settled) {
+          dirtyRef.current = false;
+          const settledPrice = String(settled.priceStroops);
+          setServerService(settled);
+          setPrice(settledPrice);
+          setOriginalPrice(settledPrice);
+        }
+      }
     }
   };
 
@@ -107,7 +193,7 @@ export default function EditServicePage({
       className="mx-auto flex min-h-[60vh] max-w-xl flex-col gap-6 p-8 focus:outline-none"
     >
       <Link
-        href={`/services/${encodeURIComponent(serviceId)}`}
+        href={"/services/" + encodeURIComponent(serviceId)}
         onClick={handleBack}
         className="text-sm text-zinc-500 hover:underline"
       >
@@ -126,23 +212,36 @@ export default function EditServicePage({
       )}
 
       {!prefillLoading && !prefillError && (
-        <form onSubmit={onSubmit} className="flex flex-col gap-3">
+        <form
+          onSubmit={onSubmit}
+          className="flex flex-col gap-3"
+          aria-busy={saving}
+        >
           <TextField
             label="Price (stroops / request)"
             inputMode="numeric"
             required
             value={price}
-            onChange={(e) => setPrice(e.target.value)}
+            onChange={(event) => setPrice(event.target.value)}
             error={error}
             description="Accepted range: 0 – 9,007,199,254,740,991 stroops"
           />
           <button
             type="submit"
-            disabled={saving}
-            className="self-start rounded-full bg-black px-5 py-2 text-sm font-medium text-white disabled:opacity-50 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-blue-500"
+            className="self-start rounded-full bg-black px-5 py-2 text-sm font-medium text-white focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-blue-500"
           >
-            {saving ? "Saving…" : "Save"}
+            {saving ? "Saving… (submit again for newer edit)" : "Save"}
           </button>
+          {announcement && (
+            <p
+              role="status"
+              aria-live="polite"
+              aria-atomic="true"
+              className="sr-only"
+            >
+              {announcement}
+            </p>
+          )}
         </form>
       )}
     </main>
diff --git a/src/app/services/[serviceId]/page.test.tsx b/src/app/services/[serviceId]/page.test.tsx
index 3adf30e..9aa8f82 100644
--- a/src/app/services/[serviceId]/page.test.tsx
+++ b/src/app/services/[serviceId]/page.test.tsx
@@ -1,6 +1,7 @@
 import { render, screen, fireEvent } from "@testing-library/react";
 import ServiceDetailPage from "./page";
 import { apiGet } from "@/lib/apiClient";
+import { __resetServiceOptimisticStoreForTests } from "@/lib/serviceOptimisticStore";
 
 jest.mock("@/lib/apiClient", () => ({
   apiGet: jest.fn(),
@@ -40,6 +41,7 @@ describe("ServiceDetailPage", () => {
 
   beforeEach(() => {
     mockApiGet.mockReset();
+    __resetServiceOptimisticStoreForTests();
     // Mock navigator.clipboard
     Object.defineProperty(global.navigator, "clipboard", {
       value: {
diff --git a/src/app/services/[serviceId]/page.tsx b/src/app/services/[serviceId]/page.tsx
index 0c0de1f..5bbc299 100644
--- a/src/app/services/[serviceId]/page.tsx
+++ b/src/app/services/[serviceId]/page.tsx
@@ -10,6 +10,7 @@ import { CopyButton } from "@/components/CopyButton";
 import { KeyValueGrid } from "@/components/KeyValueGrid";
 import { PageShell } from "@/components/PageShell";
 import { formatStroops } from "@/lib/format";
+import { useOptimisticService } from "@/lib/serviceOptimisticStore";
 
 type Service = { serviceId: string; priceStroops: number };
 type Rollup = { serviceId: string; total: number; agents: number };
@@ -24,6 +25,8 @@ export default function ServiceDetailPage({
   const [rollup, setRollup] = useState<Rollup | null>(null);
   const [error, setError] = useState<string | null>(null);
 
+  const visibleService = useOptimisticService(serviceId, service);
+
   useEffect(() => {
     let cancelled = false;
     apiGet<Service>(`/api/v1/services/${encodeURIComponent(serviceId)}`)
@@ -46,7 +49,7 @@ export default function ServiceDetailPage({
         {serviceId}
       </h1>
       {error && <ErrorMessage title="Failed to load service" detail={error} />}
-      {service && (
+      {visibleService && (
         <div className="rounded-lg border border-zinc-200 p-6 dark:border-zinc-800">
           <KeyValueGrid
             rows={[
@@ -61,7 +64,7 @@ export default function ServiceDetailPage({
               },
               {
                 label: "Price",
-                value: `${formatStroops(service.priceStroops)} (${service.priceStroops} stroops)`,
+                value: `${formatStroops(visibleService.priceStroops)} (${visibleService.priceStroops} stroops)`,
               },
               {
                 label: "Usage",
diff --git a/src/app/services/page.test.tsx b/src/app/services/page.test.tsx
index 3e91d64..0db510b 100644
--- a/src/app/services/page.test.tsx
+++ b/src/app/services/page.test.tsx
@@ -3,6 +3,10 @@ import { apiGet } from "../../lib/apiClient";
 import ServicesPage, { sortServices } from "./page";
 import { ToastProvider } from "../../components/ToastProvider";
 import { truncateMiddle } from "../../lib/format";
+import {
+  __resetServiceOptimisticStoreForTests,
+  runOptimisticServiceMutation,
+} from "../../lib/serviceOptimisticStore";
 
 jest.mock("../../lib/apiClient", () => ({
   apiGet: jest.fn(),
@@ -251,6 +255,7 @@ describe("sortServices", () => {
 describe("ServicesPage", () => {
   beforeEach(() => {
     apiGetMock.mockReset();
+    __resetServiceOptimisticStoreForTests();
     window.history.replaceState(
       null,
       "",
@@ -258,6 +263,55 @@ describe("ServicesPage", () => {
     );
   });
 
+  it("projects an optimistic price into the dashboard and rolls back only that service on failure", async () => {
+    apiGetMock.mockResolvedValueOnce({
+      services: [
+        service("svc-a", 100),
+        service("svc-b", 500),
+      ],
+      page: 1,
+      pageCount: 1,
+    } as never);
+
+    renderServicesPage();
+
+    expect(await screen.findByText("100 stroops / request")).toBeInTheDocument();
+    expect(screen.getByText("500 stroops / request")).toBeInTheDocument();
+
+    let rejectWrite!: (reason?: unknown) => void;
+    const write = new Promise<void>((_resolve, reject) => {
+      rejectWrite = reject;
+    });
+    let operation!: Promise<unknown>;
+
+    act(() => {
+      operation = runOptimisticServiceMutation({
+        serviceId: "svc-a",
+        current: service("svc-a", 100),
+        optimistic: service("svc-a", 200),
+        mutate: () => write,
+        reconcile: async () => service("svc-a", 200),
+      });
+    });
+
+    await waitFor(() => {
+      expect(screen.getByText("200 stroops / request")).toBeInTheDocument();
+    });
+    expect(screen.getByText("500 stroops / request")).toBeInTheDocument();
+
+    await act(async () => {
+      rejectWrite(new Error("private backend details"));
+      await expect(operation).rejects.toMatchObject({
+        code: "SERVICE_WRITE_FAILED",
+      });
+    });
+
+    await waitFor(() => {
+      expect(screen.getByText("100 stroops / request")).toBeInTheDocument();
+    });
+    expect(screen.getByText("500 stroops / request")).toBeInTheDocument();
+  });
+
   it("renders a spinner while the first page is loading", () => {
     apiGetMock.mockReturnValueOnce(new Promise(() => undefined) as never);
 
diff --git a/src/app/services/page.tsx b/src/app/services/page.tsx
index 75dd6ed..3921db2 100644
--- a/src/app/services/page.tsx
+++ b/src/app/services/page.tsx
@@ -11,6 +11,7 @@ import { Spinner } from "@/components/Spinner";
 import { truncateMiddle } from "@/lib/format";
 import { useToast } from "@/components/ToastProvider";
 import { useClipboard } from "@/lib/useClipboard";
+import { useOptimisticServices } from "@/lib/serviceOptimisticStore";
 
 type Service = { serviceId: string; priceStroops: number; createdAt?: number | string | null };
 type ServicesResponse = {
@@ -188,7 +189,8 @@ export default function ServicesPage() {
     getInitialSort
   );
 
-  const sortedServices = useSorted(services, sortKey, sortDir);
+  const visibleServices = useOptimisticServices(services);
+  const sortedServices = useSorted(visibleServices, sortKey, sortDir);
 
   const handleSort = (key: SortKey) => {
     const next: { key: SortKey; dir: SortDir } =
diff --git a/src/lib/__tests__/serviceOptimisticStore.test.ts b/src/lib/__tests__/serviceOptimisticStore.test.ts
new file mode 100644
index 0000000..2884bd1
--- /dev/null
+++ b/src/lib/__tests__/serviceOptimisticStore.test.ts
@@ -0,0 +1,159 @@
+import {
+  __resetServiceOptimisticStoreForTests,
+  getOptimisticService,
+  hydrateServiceSnapshot,
+  runOptimisticServiceMutation,
+  ServiceMutationError,
+} from "../serviceOptimisticStore";
+
+function deferred<T>() {
+  let resolve!: (value: T) => void;
+  let reject!: (reason?: unknown) => void;
+  const promise = new Promise<T>((resolvePromise, rejectPromise) => {
+    resolve = resolvePromise;
+    reject = rejectPromise;
+  });
+  return { promise, resolve, reject };
+}
+
+function service(serviceId: string, priceStroops: number) {
+  return { serviceId, priceStroops };
+}
+
+describe("serviceOptimisticStore", () => {
+  beforeEach(() => {
+    __resetServiceOptimisticStoreForTests();
+  });
+
+  it("shows the optimistic value immediately and replaces it with canonical server state", async () => {
+    hydrateServiceSnapshot(service("svc-a", 100));
+    const write = deferred<void>();
+    const reconcile = deferred<ReturnType<typeof service>>();
+
+    const operation = runOptimisticServiceMutation({
+      serviceId: "svc-a",
+      current: service("svc-a", 100),
+      optimistic: service("svc-a", 200),
+      mutate: () => write.promise,
+      reconcile: () => reconcile.promise,
+    });
+
+    expect(getOptimisticService("svc-a")).toEqual(service("svc-a", 200));
+
+    write.resolve();
+    reconcile.resolve(service("svc-a", 225));
+
+    await expect(operation).resolves.toEqual(service("svc-a", 225));
+    expect(getOptimisticService("svc-a")).toEqual(service("svc-a", 225));
+  });
+
+  it("rolls back exactly and returns a typed stable error when the write fails", async () => {
+    hydrateServiceSnapshot(service("svc-a", 100));
+    const write = deferred<void>();
+
+    const operation = runOptimisticServiceMutation({
+      serviceId: "svc-a",
+      current: service("svc-a", 100),
+      optimistic: service("svc-a", 200),
+      mutate: () => write.promise,
+      reconcile: async () => service("svc-a", 200),
+      failureMessage:
+        "Could not update the service. Your previous price was restored.",
+    });
+
+    expect(getOptimisticService("svc-a")).toEqual(service("svc-a", 200));
+
+    write.reject(new Error("database internals that must not escape"));
+
+    await expect(operation).rejects.toMatchObject({
+      name: "ServiceMutationError",
+      code: "SERVICE_WRITE_FAILED",
+      serviceId: "svc-a",
+      message: "Could not update the service. Your previous price was restored.",
+    });
+    expect(getOptimisticService("svc-a")).toEqual(service("svc-a", 100));
+  });
+
+  it("keeps the newest optimistic value visible while serializing same-service writes", async () => {
+    hydrateServiceSnapshot(service("svc-a", 100));
+
+    const firstWrite = deferred<void>();
+    const firstReconcile = deferred<ReturnType<typeof service>>();
+    const secondWrite = deferred<void>();
+    const secondReconcile = deferred<ReturnType<typeof service>>();
+    const firstMutate = jest.fn(() => firstWrite.promise);
+    const secondMutate = jest.fn(() => secondWrite.promise);
+
+    const first = runOptimisticServiceMutation({
+      serviceId: "svc-a",
+      current: service("svc-a", 100),
+      optimistic: service("svc-a", 200),
+      mutate: firstMutate,
+      reconcile: () => firstReconcile.promise,
+    });
+    const second = runOptimisticServiceMutation({
+      serviceId: "svc-a",
+      current: service("svc-a", 200),
+      optimistic: service("svc-a", 300),
+      mutate: secondMutate,
+      reconcile: () => secondReconcile.promise,
+    });
+
+    expect(getOptimisticService("svc-a")).toEqual(service("svc-a", 300));
+    await Promise.resolve();
+    expect(firstMutate).toHaveBeenCalledTimes(1);
+    expect(secondMutate).not.toHaveBeenCalled();
+
+    firstWrite.resolve();
+    firstReconcile.resolve(service("svc-a", 225));
+    await first;
+
+    expect(getOptimisticService("svc-a")).toEqual(service("svc-a", 300));
+
+    secondWrite.resolve();
+    secondReconcile.resolve(service("svc-a", 325));
+    await second;
+
+    expect(secondMutate).toHaveBeenCalledTimes(1);
+    expect(getOptimisticService("svc-a")).toEqual(service("svc-a", 325));
+  });
+
+  it("keeps unrelated service updates independent while one mutation rolls back", async () => {
+    hydrateServiceSnapshot(service("svc-a", 100));
+    hydrateServiceSnapshot(service("svc-b", 500));
+
+    const firstWrite = deferred<void>();
+    const secondWrite = deferred<void>();
+    const secondReconcile = deferred<ReturnType<typeof service>>();
+
+    const first = runOptimisticServiceMutation({
+      serviceId: "svc-a",
+      current: service("svc-a", 100),
+      optimistic: service("svc-a", 200),
+      mutate: () => firstWrite.promise,
+      reconcile: async () => service("svc-a", 200),
+    });
+    const second = runOptimisticServiceMutation({
+      serviceId: "svc-b",
+      current: service("svc-b", 500),
+      optimistic: service("svc-b", 600),
+      mutate: () => secondWrite.promise,
+      reconcile: () => secondReconcile.promise,
+    });
+
+    expect(getOptimisticService("svc-a")).toEqual(service("svc-a", 200));
+    expect(getOptimisticService("svc-b")).toEqual(service("svc-b", 600));
+
+    firstWrite.reject(new Error("svc-a failed"));
+    await expect(first).rejects.toBeInstanceOf(ServiceMutationError);
+
+    expect(getOptimisticService("svc-a")).toEqual(service("svc-a", 100));
+    expect(getOptimisticService("svc-b")).toEqual(service("svc-b", 600));
+
+    secondWrite.resolve();
+    secondReconcile.resolve(service("svc-b", 650));
+    await second;
+
+    expect(getOptimisticService("svc-b")).toEqual(service("svc-b", 650));
+  });
+});
diff --git a/src/lib/serviceOptimisticStore.ts b/src/lib/serviceOptimisticStore.ts
new file mode 100644
index 0000000..4ac68c8
--- /dev/null
+++ b/src/lib/serviceOptimisticStore.ts
@@ -0,0 +1,318 @@
+"use client";
+
+import { useEffect, useSyncExternalStore } from "react";
+
+export type ServiceRecord = {
+  serviceId: string;
+  priceStroops: number;
+  createdAt?: number | string | null;
+};
+
+export type ServiceMutationErrorCode =
+  | "SERVICE_WRITE_FAILED"
+  | "SERVICE_RECONCILE_FAILED";
+
+export class ServiceMutationError extends Error {
+  readonly code: ServiceMutationErrorCode;
+  readonly serviceId: string;
+
+  constructor(
+    code: ServiceMutationErrorCode,
+    serviceId: string,
+    message: string,
+  ) {
+    super(message);
+    this.name = "ServiceMutationError";
+    this.code = code;
+    this.serviceId = serviceId;
+  }
+}
+
+type ServiceEntry = {
+  base: ServiceRecord | null;
+  baseRevision: number;
+  pending: Map<number, ServiceRecord>;
+};
+
+type OptimisticServiceMutationOptions = {
+  serviceId: string;
+  current?: ServiceRecord | null;
+  optimistic: ServiceRecord;
+  mutate: () => Promise<unknown>;
+  reconcile: () => Promise<ServiceRecord>;
+  failureMessage?: string;
+  reconcileMessage?: string;
+};
+
+const entries = new Map<string, ServiceEntry>();
+const listeners = new Set<() => void>();
+const mutationTails = new Map<string, Promise<void>>();
+let storeVersion = 0;
+let nextMutationRevision = 0;
+
+const DEFAULT_FAILURE_MESSAGE =
+  "Could not save the service change. The previous value was restored.";
+const DEFAULT_RECONCILE_MESSAGE =
+  "The service was saved, but its latest server value could not be confirmed. Refresh before editing again.";
+
+function cloneService(service: ServiceRecord): ServiceRecord {
+  return { ...service };
+}
+
+function sameService(
+  first: ServiceRecord | null,
+  second: ServiceRecord,
+): boolean {
+  return (
+    first?.serviceId === second.serviceId &&
+    first.priceStroops === second.priceStroops &&
+    first.createdAt === second.createdAt
+  );
+}
+
+function getOrCreateEntry(serviceId: string): ServiceEntry {
+  let entry = entries.get(serviceId);
+  if (!entry) {
+    entry = {
+      base: null,
+      baseRevision: 0,
+      pending: new Map<number, ServiceRecord>(),
+    };
+    entries.set(serviceId, entry);
+  }
+  return entry;
+}
+
+function emitChange() {
+  storeVersion += 1;
+  for (const listener of listeners) {
+    listener();
+  }
+}
+
+function visibleValue(entry: ServiceEntry): ServiceRecord | null {
+  let newestRevision = -1;
+  let newest: ServiceRecord | null = null;
+
+  for (const [revision, service] of entry.pending) {
+    // A newer successful mutation may commit while an older request is still
+    // in flight. Once the base has advanced past that request, the older
+    // optimistic value is stale and must never become visible again.
+    if (revision <= entry.baseRevision) {
+      continue;
+    }
+
+    if (revision > newestRevision) {
+      newestRevision = revision;
+      newest = service;
+    }
+  }
+
+  return newest ?? entry.base;
+}
+
+function removePending(
+  serviceId: string,
+  entry: ServiceEntry,
+  revision: number,
+) {
+  entry.pending.delete(revision);
+  if (entry.base === null && entry.pending.size === 0) {
+    entries.delete(serviceId);
+  }
+}
+
+function reserveMutationTurn(serviceId: string) {
+  const previous = mutationTails.get(serviceId) ?? Promise.resolve();
+  const wait: Promise<void> = previous.catch(() => {});
+
+  let releaseCurrent!: () => void;
+  const current = new Promise<void>((resolve) => {
+    releaseCurrent = resolve;
+  });
+  const tail = wait.then(() => current);
+  mutationTails.set(serviceId, tail);
+
+  return {
+    wait,
+    release() {
+      releaseCurrent();
+      if (mutationTails.get(serviceId) === tail) {
+        mutationTails.delete(serviceId);
+      }
+    },
+  };
+}
+
+export function subscribeServiceOptimisticStore(listener: () => void) {
+  listeners.add(listener);
+  return () => listeners.delete(listener);
+}
+
+export function getServiceOptimisticStoreVersion() {
+  return storeVersion;
+}
+
+export function hydrateServiceSnapshot(service: ServiceRecord) {
+  const entry = getOrCreateEntry(service.serviceId);
+  if (sameService(entry.base, service)) {
+    return;
+  }
+
+  entry.base = cloneService(service);
+  emitChange();
+}
+
+export function hydrateServiceSnapshots(services: ServiceRecord[]) {
+  let changed = false;
+
+  for (const service of services) {
+    const entry = getOrCreateEntry(service.serviceId);
+    if (sameService(entry.base, service)) {
+      continue;
+    }
+
+    entry.base = cloneService(service);
+    changed = true;
+  }
+
+  if (changed) {
+    emitChange();
+  }
+}
+
+export function getOptimisticService(
+  serviceId: string,
+): ServiceRecord | null {
+  const entry = entries.get(serviceId);
+  return entry ? visibleValue(entry) : null;
+}
+
+export function useOptimisticService(
+  serviceId: string,
+  serverService: ServiceRecord | null,
+): ServiceRecord | null {
+  const version = useSyncExternalStore(
+    subscribeServiceOptimisticStore,
+    getServiceOptimisticStoreVersion,
+    getServiceOptimisticStoreVersion,
+  );
+
+  useEffect(() => {
+    if (serverService) {
+      hydrateServiceSnapshot(serverService);
+    }
+  }, [serverService]);
+
+  void version;
+  return getOptimisticService(serviceId) ?? serverService;
+}
+
+export function useOptimisticServices(
+  serverServices: ServiceRecord[] | null,
+): ServiceRecord[] | null {
+  const version = useSyncExternalStore(
+    subscribeServiceOptimisticStore,
+    getServiceOptimisticStoreVersion,
+    getServiceOptimisticStoreVersion,
+  );
+
+  useEffect(() => {
+    if (serverServices) {
+      hydrateServiceSnapshots(serverServices);
+    }
+  }, [serverServices]);
+
+  void version;
+
+  if (!serverServices) {
+    return null;
+  }
+
+  return serverServices.map(
+    (service) => getOptimisticService(service.serviceId) ?? service,
+  );
+}
+
+/**
+ * Apply one service mutation immediately and reconcile it with canonical
+ * server state after the write succeeds.
+ *
+ * Optimistic values are published immediately. Network mutation/reconciliation
+ * for one service is serialized in submit order so an older write cannot land
+ * after a newer one and leave server state behind the UI. Different services
+ * keep independent queues and can still progress concurrently. A failed
+ * mutation removes only its own revision, revealing the newest valid pending
+ * value or the committed base.
+ */
+export async function runOptimisticServiceMutation(
+  options: OptimisticServiceMutationOptions,
+): Promise<ServiceRecord> {
+  if (options.optimistic.serviceId !== options.serviceId) {
+    throw new Error("optimistic service id does not match mutation key");
+  }
+
+  const entry = getOrCreateEntry(options.serviceId);
+  if (entry.base === null && options.current) {
+    entry.base = cloneService(options.current);
+  }
+
+  const revision = ++nextMutationRevision;
+  entry.pending.set(revision, cloneService(options.optimistic));
+  emitChange();
+
+  const turn = reserveMutationTurn(options.serviceId);
+  await turn.wait;
+
+  try {
+    try {
+      await options.mutate();
+    } catch {
+      removePending(options.serviceId, entry, revision);
+      emitChange();
+      throw new ServiceMutationError(
+        "SERVICE_WRITE_FAILED",
+        options.serviceId,
+        options.failureMessage ?? DEFAULT_FAILURE_MESSAGE,
+      );
+    }
+
+    let canonical: ServiceRecord;
+    try {
+      canonical = await options.reconcile();
+      if (canonical.serviceId !== options.serviceId) {
+        throw new Error("reconciled service id does not match mutation key");
+      }
+    } catch {
+      if (revision >= entry.baseRevision) {
+        entry.base = cloneService(options.optimistic);
+        entry.baseRevision = revision;
+      }
+      removePending(options.serviceId, entry, revision);
+      emitChange();
+      throw new ServiceMutationError(
+        "SERVICE_RECONCILE_FAILED",
+        options.serviceId,
+        options.reconcileMessage ?? DEFAULT_RECONCILE_MESSAGE,
+      );
+    }
+
+    if (revision >= entry.baseRevision) {
+      entry.base = cloneService(canonical);
+      entry.baseRevision = revision;
+    }
+
+    removePending(options.serviceId, entry, revision);
+    emitChange();
+    return canonical;
+  } finally {
+    turn.release();
+  }
+}
+
+export function __resetServiceOptimisticStoreForTests() {
+  entries.clear();
+  mutationTails.clear();
+  nextMutationRevision = 0;
+  emitChange();
+}