fix(relay): guard unlink teardown generation

Co-authored-by: codex <codex@users.noreply.github.com>

Author: juliusmarminge

infra/relay/src/environments/EnvironmentConnector.test.ts

@@ -198,7 +198,9 @@ function makeAllocations(
 recordDns: ()=>Effect.die("unused"),
 markReady: ()=>Effect.die("unused"),
 claimRelease: ()=>Effect.die("unused"),
+claimDeprovision: ()=>Effect.die("unused"),
 remove: ()=>Effect.die("unused"),
+removeClaimed: ()=>Effect.die("unused"),
 };
 }
 

infra/relay/src/environments/EnvironmentLinker.test.ts

@@ -136,6 +136,7 @@ function testLayer(input?: {
 revokeForEnvironmentPublicKey: ()=>Effect.succeed(false),
 }),
 Layer.succeed(ManagedEndpointProvider.ManagedEndpointProvider,{
+prepareDeprovision: ()=>Effect.succeed(null),
 deprovision: input?.deprovision??(()=>Effect.void),
 release: ()=>Effect.succeed(true),
 provision: ()=>

infra/relay/src/environments/ManagedEndpointAllocations.test.ts

@@ -10,6 +10,61 @@ const layerWithDb = (db: RelayDb.RelayDb["Service"]) =>
 ManagedEndpointAllocations.layer.pipe(Layer.provide(Layer.succeed(RelayDb.RelayDb,db)));
 
 describe("ManagedEndpointAllocations",()=>{
+it.effect("returns a claim generation only when deprovision wins the allocation CAS",()=>{
+letclaimedAt: string|undefined;
+constfakeDb={
+update: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+set: (values: {readonlyupdatedAt: string})=>{
+claimedAt=values.updatedAt;
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([{userId: "user-1"}]),
+}),
+};
+},
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+constgeneration=yield*allocations.claimDeprovision({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "captured-generation",
+});
+
+expect(generation).toBe(claimedAt);
+expect(generation).not.toBeNull();
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
+it.effect("does not remove an allocation superseded after a deprovision claim",()=>{
+constfakeDb={
+delete: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([]),
+}),
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+expect(
+yield*allocations.removeClaimed({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "outdated-claim-generation",
+}),
+).toBe(false);
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
 it.effect("retains database failures with allocation operation and identity",()=>{
 constcause=newError("database unavailable");
 constfakeDb={

infra/relay/src/environments/ManagedEndpointAllocations.ts

@@ -51,7 +51,9 @@ export class ManagedEndpointAllocationPersistenceError extends Schema.TaggedErro
 "record-dns",
 "mark-ready",
 "claim-release",
+"claim-deprovision",
 "remove",
+"remove-claimed",
 ]),
 stage: Schema.Literals(["database-request","resolve-reservation"]),
 userId: Schema.String,
@@ -91,6 +93,14 @@ interface ClaimManagedEndpointReleaseInput extends ManagedEndpointAllocationKey
 readonlyupdatedAt: string;
 }
 
+interfaceClaimManagedEndpointDeprovisionInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
+interfaceRemoveClaimedManagedEndpointAllocationInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
 exportclassManagedEndpointAllocationsextendsContext.Service<
 ManagedEndpointAllocations,
 {
@@ -119,9 +129,22 @@ export class ManagedEndpointAllocations extends Context.Service<
 readonlyclaimRelease: (
 input: ClaimManagedEndpointReleaseInput,
 )=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
+/**
+ * Claims the complete allocation for teardown only if its generation still
+ * matches the snapshot captured by the unlink operation.
+ *
+ * Returns the claim generation used by `removeClaimed`, or null when a
+ * concurrent provision has already superseded the snapshot.
+ */
+readonlyclaimDeprovision: (
+input: ClaimManagedEndpointDeprovisionInput,
+)=>Effect.Effect<string|null,ManagedEndpointAllocationPersistenceError>;
 readonlyremove: (
 input: ManagedEndpointAllocationKey,
 )=>Effect.Effect<void,ManagedEndpointAllocationPersistenceError>;
+readonlyremoveClaimed: (
+input: RemoveClaimedManagedEndpointAllocationInput,
+)=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
 }
 >()("t3code-relay/environments/ManagedEndpointAllocations"){}
 
@@ -321,6 +344,35 @@ export const make = Effect.gen(function* () {
 );
 returnclaimed;
 }),
+claimDeprovision: Effect.fn("relay.managed_endpoint_allocations.claim_deprovision")(function*(
+input: ClaimManagedEndpointDeprovisionInput,
+){
+constclaimedAt=DateTime.formatIso(yield*DateTime.now);
+constclaimed=yield*db
+.update(relayManagedEndpointAllocations)
+.set({updatedAt: claimedAt})
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "claim-deprovision",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+returnclaimed ? claimedAt : null;
+}),
 remove: Effect.fn("relay.managed_endpoint_allocations.remove")(function*(
 input: ManagedEndpointAllocationKey,
 ){
@@ -339,6 +391,32 @@ export const make = Effect.gen(function* () {
 ),
 );
 }),
+removeClaimed: Effect.fn("relay.managed_endpoint_allocations.remove_claimed")(function*(
+input: RemoveClaimedManagedEndpointAllocationInput,
+){
+returnyield*db
+.delete(relayManagedEndpointAllocations)
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "remove-claimed",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+}),
 });
 });
 

infra/relay/src/environments/ManagedEndpointProvider.test.ts

@@ -50,7 +50,9 @@ interface AllocationCall {
 |"recordDns"
 |"markReady"
 |"claimRelease"
-|"remove";
+|"claimDeprovision"
+|"remove"
+|"removeClaimed";
 readonlyinput: unknown;
 }
 
@@ -226,11 +228,31 @@ function makeAllocations(calls: AllocationCall[] = []) {
 mutate(allocationKey(input),(current)=>current);
 returntrue;
 }),
+claimDeprovision: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "claimDeprovision", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnnull;
+}
+mutate(allocationKey(input),(current)=>current);
+returnallocations.get(allocationKey(input))?.updatedAt??null;
+}),
 remove: (input)=>
 Effect.sync(()=>{
 calls.push({operation: "remove", input });
 allocations.delete(allocationKey(input));
 }),
+removeClaimed: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "removeClaimed", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnfalse;
+}
+allocations.delete(allocationKey(input));
+returntrue;
+}),
 });
 }
 
@@ -774,12 +796,54 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 },
 );
 
+it.effect("does not deprovision an allocation superseded by a concurrent relink",()=>{
+consttunnelCalls: TunnelCall[]=[];
+constdnsCalls: DnsCall[]=[];
+constallocationCalls: AllocationCall[]=[];
+constlayer=providerLayer(
+makePersistentTunnelClient(tunnelCalls),
+makeDnsClient(dnsCalls),
+makeAllocations(allocationCalls),
+);
+
+returnEffect.gen(function*(){
+constprovider=yield*ManagedEndpointProvider.ManagedEndpointProvider;
+constkey={userId: "user_ABC",environmentId: "env_ABC"}asconst;
+constrequest={
+ ...key,
+origin: {localHttpHost: "127.0.0.1",localHttpPort: 3773},
+}asconst;
+yield*provider.provision(request);
+constunlinkTarget=yield*provider.prepareDeprovision(key);
+expect(unlinkTarget).not.toBeNull();
+if(unlinkTarget===null){
+return;
+}
+
+// A relink refreshes the allocation generation after unlink captured its
+// target but before unlink begins external teardown.
+yield*provider.provision(request);
+consttunnelCallCount=tunnelCalls.length;
+constdnsCallCount=dnsCalls.length;
+constallocationCallCount=allocationCalls.length;
+
+yield*provider.deprovision({ ...key,target: unlinkTarget});
+
+expect(tunnelCalls).toHaveLength(tunnelCallCount);
+expect(dnsCalls).toHaveLength(dnsCallCount);
+expect(allocationCalls.slice(allocationCallCount).map((call)=>call.operation)).toEqual([
+"claimDeprovision",
+]);
+}).pipe(Effect.provide(layer));
+});
+
 it.effect("releases the tunnel while keeping the allocation, DNS record, and hostname",()=>{
 consttunnelCalls: TunnelCall[]=[];
 constdnsCalls: DnsCall[]=[];
@@ -1004,8 +1068,10 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
+"claimDeprovision",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 });
@@ -1046,7 +1112,7 @@ describe("ManagedEndpointProvider", () => {
 });
 yield*provider.deprovision(key);
 
-expect(allocationCalls.map((call)=>call.operation)).toContain("remove");
+expect(allocationCalls.map((call)=>call.operation)).toContain("removeClaimed");
 }).pipe(Effect.provide(layer));
 });
 

infra/relay/src/environments/EnvironmentConnector.test.ts

@@ -198,7 +198,9 @@ function makeAllocations(
 recordDns: ()=>Effect.die("unused"),
 markReady: ()=>Effect.die("unused"),
 claimRelease: ()=>Effect.die("unused"),
+claimDeprovision: ()=>Effect.die("unused"),
 remove: ()=>Effect.die("unused"),
+removeClaimed: ()=>Effect.die("unused"),
 };
 }
 

infra/relay/src/environments/EnvironmentLinker.test.ts

@@ -136,6 +136,7 @@ function testLayer(input?: {
 revokeForEnvironmentPublicKey: ()=>Effect.succeed(false),
 }),
 Layer.succeed(ManagedEndpointProvider.ManagedEndpointProvider,{
+prepareDeprovision: ()=>Effect.succeed(null),
 deprovision: input?.deprovision??(()=>Effect.void),
 release: ()=>Effect.succeed(true),
 provision: ()=>

infra/relay/src/environments/ManagedEndpointAllocations.test.ts

@@ -10,6 +10,61 @@ const layerWithDb = (db: RelayDb.RelayDb["Service"]) =>
 ManagedEndpointAllocations.layer.pipe(Layer.provide(Layer.succeed(RelayDb.RelayDb,db)));
 
 describe("ManagedEndpointAllocations",()=>{
+it.effect("returns a claim generation only when deprovision wins the allocation CAS",()=>{
+letclaimedAt: string|undefined;
+constfakeDb={
+update: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+set: (values: {readonlyupdatedAt: string})=>{
+claimedAt=values.updatedAt;
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([{userId: "user-1"}]),
+}),
+};
+},
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+constgeneration=yield*allocations.claimDeprovision({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "captured-generation",
+});
+
+expect(generation).toBe(claimedAt);
+expect(generation).not.toBeNull();
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
+it.effect("does not remove an allocation superseded after a deprovision claim",()=>{
+constfakeDb={
+delete: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([]),
+}),
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+expect(
+yield*allocations.removeClaimed({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "outdated-claim-generation",
+}),
+).toBe(false);
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
 it.effect("retains database failures with allocation operation and identity",()=>{
 constcause=newError("database unavailable");
 constfakeDb={

infra/relay/src/environments/ManagedEndpointAllocations.ts

@@ -51,7 +51,9 @@ export class ManagedEndpointAllocationPersistenceError extends Schema.TaggedErro
 "record-dns",
 "mark-ready",
 "claim-release",
+"claim-deprovision",
 "remove",
+"remove-claimed",
 ]),
 stage: Schema.Literals(["database-request","resolve-reservation"]),
 userId: Schema.String,
@@ -91,6 +93,14 @@ interface ClaimManagedEndpointReleaseInput extends ManagedEndpointAllocationKey
 readonlyupdatedAt: string;
 }
 
+interfaceClaimManagedEndpointDeprovisionInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
+interfaceRemoveClaimedManagedEndpointAllocationInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
 exportclassManagedEndpointAllocationsextendsContext.Service<
 ManagedEndpointAllocations,
 {
@@ -119,9 +129,22 @@ export class ManagedEndpointAllocations extends Context.Service<
 readonlyclaimRelease: (
 input: ClaimManagedEndpointReleaseInput,
 )=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
+/**
+ * Claims the complete allocation for teardown only if its generation still
+ * matches the snapshot captured by the unlink operation.
+ *
+ * Returns the claim generation used by `removeClaimed`, or null when a
+ * concurrent provision has already superseded the snapshot.
+ */
+readonlyclaimDeprovision: (
+input: ClaimManagedEndpointDeprovisionInput,
+)=>Effect.Effect<string|null,ManagedEndpointAllocationPersistenceError>;
 readonlyremove: (
 input: ManagedEndpointAllocationKey,
 )=>Effect.Effect<void,ManagedEndpointAllocationPersistenceError>;
+readonlyremoveClaimed: (
+input: RemoveClaimedManagedEndpointAllocationInput,
+)=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
 }
 >()("t3code-relay/environments/ManagedEndpointAllocations"){}
 
@@ -321,6 +344,35 @@ export const make = Effect.gen(function* () {
 );
 returnclaimed;
 }),
+claimDeprovision: Effect.fn("relay.managed_endpoint_allocations.claim_deprovision")(function*(
+input: ClaimManagedEndpointDeprovisionInput,
+){
+constclaimedAt=DateTime.formatIso(yield*DateTime.now);
+constclaimed=yield*db
+.update(relayManagedEndpointAllocations)
+.set({updatedAt: claimedAt})
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "claim-deprovision",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+returnclaimed ? claimedAt : null;
+}),
 remove: Effect.fn("relay.managed_endpoint_allocations.remove")(function*(
 input: ManagedEndpointAllocationKey,
 ){
@@ -339,6 +391,32 @@ export const make = Effect.gen(function* () {
 ),
 );
 }),
+removeClaimed: Effect.fn("relay.managed_endpoint_allocations.remove_claimed")(function*(
+input: RemoveClaimedManagedEndpointAllocationInput,
+){
+returnyield*db
+.delete(relayManagedEndpointAllocations)
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "remove-claimed",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+}),
 });
 });
 

infra/relay/src/environments/ManagedEndpointProvider.test.ts

@@ -50,7 +50,9 @@ interface AllocationCall {
 |"recordDns"
 |"markReady"
 |"claimRelease"
-|"remove";
+|"claimDeprovision"
+|"remove"
+|"removeClaimed";
 readonlyinput: unknown;
 }
 
@@ -226,11 +228,31 @@ function makeAllocations(calls: AllocationCall[] = []) {
 mutate(allocationKey(input),(current)=>current);
 returntrue;
 }),
+claimDeprovision: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "claimDeprovision", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnnull;
+}
+mutate(allocationKey(input),(current)=>current);
+returnallocations.get(allocationKey(input))?.updatedAt??null;
+}),
 remove: (input)=>
 Effect.sync(()=>{
 calls.push({operation: "remove", input });
 allocations.delete(allocationKey(input));
 }),
+removeClaimed: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "removeClaimed", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnfalse;
+}
+allocations.delete(allocationKey(input));
+returntrue;
+}),
 });
 }
 
@@ -774,12 +796,54 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 },
 );
 
+it.effect("does not deprovision an allocation superseded by a concurrent relink",()=>{
+consttunnelCalls: TunnelCall[]=[];
+constdnsCalls: DnsCall[]=[];
+constallocationCalls: AllocationCall[]=[];
+constlayer=providerLayer(
+makePersistentTunnelClient(tunnelCalls),
+makeDnsClient(dnsCalls),
+makeAllocations(allocationCalls),
+);
+
+returnEffect.gen(function*(){
+constprovider=yield*ManagedEndpointProvider.ManagedEndpointProvider;
+constkey={userId: "user_ABC",environmentId: "env_ABC"}asconst;
+constrequest={
+ ...key,
+origin: {localHttpHost: "127.0.0.1",localHttpPort: 3773},
+}asconst;
+yield*provider.provision(request);
+constunlinkTarget=yield*provider.prepareDeprovision(key);
+expect(unlinkTarget).not.toBeNull();
+if(unlinkTarget===null){
+return;
+}
+
+// A relink refreshes the allocation generation after unlink captured its
+// target but before unlink begins external teardown.
+yield*provider.provision(request);
+consttunnelCallCount=tunnelCalls.length;
+constdnsCallCount=dnsCalls.length;
+constallocationCallCount=allocationCalls.length;
+
+yield*provider.deprovision({ ...key,target: unlinkTarget});
+
+expect(tunnelCalls).toHaveLength(tunnelCallCount);
+expect(dnsCalls).toHaveLength(dnsCallCount);
+expect(allocationCalls.slice(allocationCallCount).map((call)=>call.operation)).toEqual([
+"claimDeprovision",
+]);
+}).pipe(Effect.provide(layer));
+});
+
 it.effect("releases the tunnel while keeping the allocation, DNS record, and hostname",()=>{
 consttunnelCalls: TunnelCall[]=[];
 constdnsCalls: DnsCall[]=[];
@@ -1004,8 +1068,10 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
+"claimDeprovision",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 });
@@ -1046,7 +1112,7 @@ describe("ManagedEndpointProvider", () => {
 });
 yield*provider.deprovision(key);
 
-expect(allocationCalls.map((call)=>call.operation)).toContain("remove");
+expect(allocationCalls.map((call)=>call.operation)).toContain("removeClaimed");
 }).pipe(Effect.provide(layer));
 });
 

infra/relay/src/environments/EnvironmentConnector.test.ts

@@ -198,7 +198,9 @@ function makeAllocations(
 recordDns: ()=>Effect.die("unused"),
 markReady: ()=>Effect.die("unused"),
 claimRelease: ()=>Effect.die("unused"),
+claimDeprovision: ()=>Effect.die("unused"),
 remove: ()=>Effect.die("unused"),
+removeClaimed: ()=>Effect.die("unused"),
 };
 }
 

infra/relay/src/environments/EnvironmentLinker.test.ts

@@ -136,6 +136,7 @@ function testLayer(input?: {
 revokeForEnvironmentPublicKey: ()=>Effect.succeed(false),
 }),
 Layer.succeed(ManagedEndpointProvider.ManagedEndpointProvider,{
+prepareDeprovision: ()=>Effect.succeed(null),
 deprovision: input?.deprovision??(()=>Effect.void),
 release: ()=>Effect.succeed(true),
 provision: ()=>

infra/relay/src/environments/ManagedEndpointAllocations.test.ts

@@ -10,6 +10,61 @@ const layerWithDb = (db: RelayDb.RelayDb["Service"]) =>
 ManagedEndpointAllocations.layer.pipe(Layer.provide(Layer.succeed(RelayDb.RelayDb,db)));
 
 describe("ManagedEndpointAllocations",()=>{
+it.effect("returns a claim generation only when deprovision wins the allocation CAS",()=>{
+letclaimedAt: string|undefined;
+constfakeDb={
+update: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+set: (values: {readonlyupdatedAt: string})=>{
+claimedAt=values.updatedAt;
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([{userId: "user-1"}]),
+}),
+};
+},
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+constgeneration=yield*allocations.claimDeprovision({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "captured-generation",
+});
+
+expect(generation).toBe(claimedAt);
+expect(generation).not.toBeNull();
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
+it.effect("does not remove an allocation superseded after a deprovision claim",()=>{
+constfakeDb={
+delete: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([]),
+}),
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+expect(
+yield*allocations.removeClaimed({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "outdated-claim-generation",
+}),
+).toBe(false);
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
 it.effect("retains database failures with allocation operation and identity",()=>{
 constcause=newError("database unavailable");
 constfakeDb={

infra/relay/src/environments/ManagedEndpointAllocations.ts

@@ -51,7 +51,9 @@ export class ManagedEndpointAllocationPersistenceError extends Schema.TaggedErro
 "record-dns",
 "mark-ready",
 "claim-release",
+"claim-deprovision",
 "remove",
+"remove-claimed",
 ]),
 stage: Schema.Literals(["database-request","resolve-reservation"]),
 userId: Schema.String,
@@ -91,6 +93,14 @@ interface ClaimManagedEndpointReleaseInput extends ManagedEndpointAllocationKey
 readonlyupdatedAt: string;
 }
 
+interfaceClaimManagedEndpointDeprovisionInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
+interfaceRemoveClaimedManagedEndpointAllocationInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
 exportclassManagedEndpointAllocationsextendsContext.Service<
 ManagedEndpointAllocations,
 {
@@ -119,9 +129,22 @@ export class ManagedEndpointAllocations extends Context.Service<
 readonlyclaimRelease: (
 input: ClaimManagedEndpointReleaseInput,
 )=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
+/**
+ * Claims the complete allocation for teardown only if its generation still
+ * matches the snapshot captured by the unlink operation.
+ *
+ * Returns the claim generation used by `removeClaimed`, or null when a
+ * concurrent provision has already superseded the snapshot.
+ */
+readonlyclaimDeprovision: (
+input: ClaimManagedEndpointDeprovisionInput,
+)=>Effect.Effect<string|null,ManagedEndpointAllocationPersistenceError>;
 readonlyremove: (
 input: ManagedEndpointAllocationKey,
 )=>Effect.Effect<void,ManagedEndpointAllocationPersistenceError>;
+readonlyremoveClaimed: (
+input: RemoveClaimedManagedEndpointAllocationInput,
+)=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
 }
 >()("t3code-relay/environments/ManagedEndpointAllocations"){}
 
@@ -321,6 +344,35 @@ export const make = Effect.gen(function* () {
 );
 returnclaimed;
 }),
+claimDeprovision: Effect.fn("relay.managed_endpoint_allocations.claim_deprovision")(function*(
+input: ClaimManagedEndpointDeprovisionInput,
+){
+constclaimedAt=DateTime.formatIso(yield*DateTime.now);
+constclaimed=yield*db
+.update(relayManagedEndpointAllocations)
+.set({updatedAt: claimedAt})
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "claim-deprovision",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+returnclaimed ? claimedAt : null;
+}),
 remove: Effect.fn("relay.managed_endpoint_allocations.remove")(function*(
 input: ManagedEndpointAllocationKey,
 ){
@@ -339,6 +391,32 @@ export const make = Effect.gen(function* () {
 ),
 );
 }),
+removeClaimed: Effect.fn("relay.managed_endpoint_allocations.remove_claimed")(function*(
+input: RemoveClaimedManagedEndpointAllocationInput,
+){
+returnyield*db
+.delete(relayManagedEndpointAllocations)
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "remove-claimed",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+}),
 });
 });
 

infra/relay/src/environments/ManagedEndpointProvider.test.ts

@@ -50,7 +50,9 @@ interface AllocationCall {
 |"recordDns"
 |"markReady"
 |"claimRelease"
-|"remove";
+|"claimDeprovision"
+|"remove"
+|"removeClaimed";
 readonlyinput: unknown;
 }
 
@@ -226,11 +228,31 @@ function makeAllocations(calls: AllocationCall[] = []) {
 mutate(allocationKey(input),(current)=>current);
 returntrue;
 }),
+claimDeprovision: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "claimDeprovision", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnnull;
+}
+mutate(allocationKey(input),(current)=>current);
+returnallocations.get(allocationKey(input))?.updatedAt??null;
+}),
 remove: (input)=>
 Effect.sync(()=>{
 calls.push({operation: "remove", input });
 allocations.delete(allocationKey(input));
 }),
+removeClaimed: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "removeClaimed", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnfalse;
+}
+allocations.delete(allocationKey(input));
+returntrue;
+}),
 });
 }
 
@@ -774,12 +796,54 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 },
 );
 
+it.effect("does not deprovision an allocation superseded by a concurrent relink",()=>{
+consttunnelCalls: TunnelCall[]=[];
+constdnsCalls: DnsCall[]=[];
+constallocationCalls: AllocationCall[]=[];
+constlayer=providerLayer(
+makePersistentTunnelClient(tunnelCalls),
+makeDnsClient(dnsCalls),
+makeAllocations(allocationCalls),
+);
+
+returnEffect.gen(function*(){
+constprovider=yield*ManagedEndpointProvider.ManagedEndpointProvider;
+constkey={userId: "user_ABC",environmentId: "env_ABC"}asconst;
+constrequest={
+ ...key,
+origin: {localHttpHost: "127.0.0.1",localHttpPort: 3773},
+}asconst;
+yield*provider.provision(request);
+constunlinkTarget=yield*provider.prepareDeprovision(key);
+expect(unlinkTarget).not.toBeNull();
+if(unlinkTarget===null){
+return;
+}
+
+// A relink refreshes the allocation generation after unlink captured its
+// target but before unlink begins external teardown.
+yield*provider.provision(request);
+consttunnelCallCount=tunnelCalls.length;
+constdnsCallCount=dnsCalls.length;
+constallocationCallCount=allocationCalls.length;
+
+yield*provider.deprovision({ ...key,target: unlinkTarget});
+
+expect(tunnelCalls).toHaveLength(tunnelCallCount);
+expect(dnsCalls).toHaveLength(dnsCallCount);
+expect(allocationCalls.slice(allocationCallCount).map((call)=>call.operation)).toEqual([
+"claimDeprovision",
+]);
+}).pipe(Effect.provide(layer));
+});
+
 it.effect("releases the tunnel while keeping the allocation, DNS record, and hostname",()=>{
 consttunnelCalls: TunnelCall[]=[];
 constdnsCalls: DnsCall[]=[];
@@ -1004,8 +1068,10 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
+"claimDeprovision",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 });
@@ -1046,7 +1112,7 @@ describe("ManagedEndpointProvider", () => {
 });
 yield*provider.deprovision(key);
 
-expect(allocationCalls.map((call)=>call.operation)).toContain("remove");
+expect(allocationCalls.map((call)=>call.operation)).toContain("removeClaimed");
 }).pipe(Effect.provide(layer));
 });
 

infra/relay/src/environments/EnvironmentConnector.test.ts

@@ -198,7 +198,9 @@ function makeAllocations(
 recordDns: ()=>Effect.die("unused"),
 markReady: ()=>Effect.die("unused"),
 claimRelease: ()=>Effect.die("unused"),
+claimDeprovision: ()=>Effect.die("unused"),
 remove: ()=>Effect.die("unused"),
+removeClaimed: ()=>Effect.die("unused"),
 };
 }
 

infra/relay/src/environments/EnvironmentLinker.test.ts

@@ -136,6 +136,7 @@ function testLayer(input?: {
 revokeForEnvironmentPublicKey: ()=>Effect.succeed(false),
 }),
 Layer.succeed(ManagedEndpointProvider.ManagedEndpointProvider,{
+prepareDeprovision: ()=>Effect.succeed(null),
 deprovision: input?.deprovision??(()=>Effect.void),
 release: ()=>Effect.succeed(true),
 provision: ()=>

infra/relay/src/environments/ManagedEndpointAllocations.test.ts

@@ -10,6 +10,61 @@ const layerWithDb = (db: RelayDb.RelayDb["Service"]) =>
 ManagedEndpointAllocations.layer.pipe(Layer.provide(Layer.succeed(RelayDb.RelayDb,db)));
 
 describe("ManagedEndpointAllocations",()=>{
+it.effect("returns a claim generation only when deprovision wins the allocation CAS",()=>{
+letclaimedAt: string|undefined;
+constfakeDb={
+update: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+set: (values: {readonlyupdatedAt: string})=>{
+claimedAt=values.updatedAt;
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([{userId: "user-1"}]),
+}),
+};
+},
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+constgeneration=yield*allocations.claimDeprovision({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "captured-generation",
+});
+
+expect(generation).toBe(claimedAt);
+expect(generation).not.toBeNull();
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
+it.effect("does not remove an allocation superseded after a deprovision claim",()=>{
+constfakeDb={
+delete: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([]),
+}),
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+expect(
+yield*allocations.removeClaimed({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "outdated-claim-generation",
+}),
+).toBe(false);
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
 it.effect("retains database failures with allocation operation and identity",()=>{
 constcause=newError("database unavailable");
 constfakeDb={

infra/relay/src/environments/ManagedEndpointAllocations.ts

@@ -51,7 +51,9 @@ export class ManagedEndpointAllocationPersistenceError extends Schema.TaggedErro
 "record-dns",
 "mark-ready",
 "claim-release",
+"claim-deprovision",
 "remove",
+"remove-claimed",
 ]),
 stage: Schema.Literals(["database-request","resolve-reservation"]),
 userId: Schema.String,
@@ -91,6 +93,14 @@ interface ClaimManagedEndpointReleaseInput extends ManagedEndpointAllocationKey
 readonlyupdatedAt: string;
 }
 
+interfaceClaimManagedEndpointDeprovisionInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
+interfaceRemoveClaimedManagedEndpointAllocationInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
 exportclassManagedEndpointAllocationsextendsContext.Service<
 ManagedEndpointAllocations,
 {
@@ -119,9 +129,22 @@ export class ManagedEndpointAllocations extends Context.Service<
 readonlyclaimRelease: (
 input: ClaimManagedEndpointReleaseInput,
 )=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
+/**
+ * Claims the complete allocation for teardown only if its generation still
+ * matches the snapshot captured by the unlink operation.
+ *
+ * Returns the claim generation used by `removeClaimed`, or null when a
+ * concurrent provision has already superseded the snapshot.
+ */
+readonlyclaimDeprovision: (
+input: ClaimManagedEndpointDeprovisionInput,
+)=>Effect.Effect<string|null,ManagedEndpointAllocationPersistenceError>;
 readonlyremove: (
 input: ManagedEndpointAllocationKey,
 )=>Effect.Effect<void,ManagedEndpointAllocationPersistenceError>;
+readonlyremoveClaimed: (
+input: RemoveClaimedManagedEndpointAllocationInput,
+)=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
 }
 >()("t3code-relay/environments/ManagedEndpointAllocations"){}
 
@@ -321,6 +344,35 @@ export const make = Effect.gen(function* () {
 );
 returnclaimed;
 }),
+claimDeprovision: Effect.fn("relay.managed_endpoint_allocations.claim_deprovision")(function*(
+input: ClaimManagedEndpointDeprovisionInput,
+){
+constclaimedAt=DateTime.formatIso(yield*DateTime.now);
+constclaimed=yield*db
+.update(relayManagedEndpointAllocations)
+.set({updatedAt: claimedAt})
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "claim-deprovision",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+returnclaimed ? claimedAt : null;
+}),
 remove: Effect.fn("relay.managed_endpoint_allocations.remove")(function*(
 input: ManagedEndpointAllocationKey,
 ){
@@ -339,6 +391,32 @@ export const make = Effect.gen(function* () {
 ),
 );
 }),
+removeClaimed: Effect.fn("relay.managed_endpoint_allocations.remove_claimed")(function*(
+input: RemoveClaimedManagedEndpointAllocationInput,
+){
+returnyield*db
+.delete(relayManagedEndpointAllocations)
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "remove-claimed",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+}),
 });
 });
 

infra/relay/src/environments/ManagedEndpointProvider.test.ts

@@ -50,7 +50,9 @@ interface AllocationCall {
 |"recordDns"
 |"markReady"
 |"claimRelease"
-|"remove";
+|"claimDeprovision"
+|"remove"
+|"removeClaimed";
 readonlyinput: unknown;
 }
 
@@ -226,11 +228,31 @@ function makeAllocations(calls: AllocationCall[] = []) {
 mutate(allocationKey(input),(current)=>current);
 returntrue;
 }),
+claimDeprovision: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "claimDeprovision", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnnull;
+}
+mutate(allocationKey(input),(current)=>current);
+returnallocations.get(allocationKey(input))?.updatedAt??null;
+}),
 remove: (input)=>
 Effect.sync(()=>{
 calls.push({operation: "remove", input });
 allocations.delete(allocationKey(input));
 }),
+removeClaimed: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "removeClaimed", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnfalse;
+}
+allocations.delete(allocationKey(input));
+returntrue;
+}),
 });
 }
 
@@ -774,12 +796,54 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 },
 );
 
+it.effect("does not deprovision an allocation superseded by a concurrent relink",()=>{
+consttunnelCalls: TunnelCall[]=[];
+constdnsCalls: DnsCall[]=[];
+constallocationCalls: AllocationCall[]=[];
+constlayer=providerLayer(
+makePersistentTunnelClient(tunnelCalls),
+makeDnsClient(dnsCalls),
+makeAllocations(allocationCalls),
+);
+
+returnEffect.gen(function*(){
+constprovider=yield*ManagedEndpointProvider.ManagedEndpointProvider;
+constkey={userId: "user_ABC",environmentId: "env_ABC"}asconst;
+constrequest={
+ ...key,
+origin: {localHttpHost: "127.0.0.1",localHttpPort: 3773},
+}asconst;
+yield*provider.provision(request);
+constunlinkTarget=yield*provider.prepareDeprovision(key);
+expect(unlinkTarget).not.toBeNull();
+if(unlinkTarget===null){
+return;
+}
+
+// A relink refreshes the allocation generation after unlink captured its
+// target but before unlink begins external teardown.
+yield*provider.provision(request);
+consttunnelCallCount=tunnelCalls.length;
+constdnsCallCount=dnsCalls.length;
+constallocationCallCount=allocationCalls.length;
+
+yield*provider.deprovision({ ...key,target: unlinkTarget});
+
+expect(tunnelCalls).toHaveLength(tunnelCallCount);
+expect(dnsCalls).toHaveLength(dnsCallCount);
+expect(allocationCalls.slice(allocationCallCount).map((call)=>call.operation)).toEqual([
+"claimDeprovision",
+]);
+}).pipe(Effect.provide(layer));
+});
+
 it.effect("releases the tunnel while keeping the allocation, DNS record, and hostname",()=>{
 consttunnelCalls: TunnelCall[]=[];
 constdnsCalls: DnsCall[]=[];
@@ -1004,8 +1068,10 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
+"claimDeprovision",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 });
@@ -1046,7 +1112,7 @@ describe("ManagedEndpointProvider", () => {
 });
 yield*provider.deprovision(key);
 
-expect(allocationCalls.map((call)=>call.operation)).toContain("remove");
+expect(allocationCalls.map((call)=>call.operation)).toContain("removeClaimed");
 }).pipe(Effect.provide(layer));
 });
 

infra/relay/src/environments/EnvironmentConnector.test.ts

@@ -198,7 +198,9 @@ function makeAllocations(
 recordDns: ()=>Effect.die("unused"),
 markReady: ()=>Effect.die("unused"),
 claimRelease: ()=>Effect.die("unused"),
+claimDeprovision: ()=>Effect.die("unused"),
 remove: ()=>Effect.die("unused"),
+removeClaimed: ()=>Effect.die("unused"),
 };
 }
 

infra/relay/src/environments/EnvironmentLinker.test.ts

@@ -136,6 +136,7 @@ function testLayer(input?: {
 revokeForEnvironmentPublicKey: ()=>Effect.succeed(false),
 }),
 Layer.succeed(ManagedEndpointProvider.ManagedEndpointProvider,{
+prepareDeprovision: ()=>Effect.succeed(null),
 deprovision: input?.deprovision??(()=>Effect.void),
 release: ()=>Effect.succeed(true),
 provision: ()=>

infra/relay/src/environments/ManagedEndpointAllocations.test.ts

@@ -10,6 +10,61 @@ const layerWithDb = (db: RelayDb.RelayDb["Service"]) =>
 ManagedEndpointAllocations.layer.pipe(Layer.provide(Layer.succeed(RelayDb.RelayDb,db)));
 
 describe("ManagedEndpointAllocations",()=>{
+it.effect("returns a claim generation only when deprovision wins the allocation CAS",()=>{
+letclaimedAt: string|undefined;
+constfakeDb={
+update: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+set: (values: {readonlyupdatedAt: string})=>{
+claimedAt=values.updatedAt;
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([{userId: "user-1"}]),
+}),
+};
+},
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+constgeneration=yield*allocations.claimDeprovision({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "captured-generation",
+});
+
+expect(generation).toBe(claimedAt);
+expect(generation).not.toBeNull();
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
+it.effect("does not remove an allocation superseded after a deprovision claim",()=>{
+constfakeDb={
+delete: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([]),
+}),
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+expect(
+yield*allocations.removeClaimed({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "outdated-claim-generation",
+}),
+).toBe(false);
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
 it.effect("retains database failures with allocation operation and identity",()=>{
 constcause=newError("database unavailable");
 constfakeDb={

infra/relay/src/environments/ManagedEndpointAllocations.ts

@@ -51,7 +51,9 @@ export class ManagedEndpointAllocationPersistenceError extends Schema.TaggedErro
 "record-dns",
 "mark-ready",
 "claim-release",
+"claim-deprovision",
 "remove",
+"remove-claimed",
 ]),
 stage: Schema.Literals(["database-request","resolve-reservation"]),
 userId: Schema.String,
@@ -91,6 +93,14 @@ interface ClaimManagedEndpointReleaseInput extends ManagedEndpointAllocationKey
 readonlyupdatedAt: string;
 }
 
+interfaceClaimManagedEndpointDeprovisionInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
+interfaceRemoveClaimedManagedEndpointAllocationInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
 exportclassManagedEndpointAllocationsextendsContext.Service<
 ManagedEndpointAllocations,
 {
@@ -119,9 +129,22 @@ export class ManagedEndpointAllocations extends Context.Service<
 readonlyclaimRelease: (
 input: ClaimManagedEndpointReleaseInput,
 )=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
+/**
+ * Claims the complete allocation for teardown only if its generation still
+ * matches the snapshot captured by the unlink operation.
+ *
+ * Returns the claim generation used by `removeClaimed`, or null when a
+ * concurrent provision has already superseded the snapshot.
+ */
+readonlyclaimDeprovision: (
+input: ClaimManagedEndpointDeprovisionInput,
+)=>Effect.Effect<string|null,ManagedEndpointAllocationPersistenceError>;
 readonlyremove: (
 input: ManagedEndpointAllocationKey,
 )=>Effect.Effect<void,ManagedEndpointAllocationPersistenceError>;
+readonlyremoveClaimed: (
+input: RemoveClaimedManagedEndpointAllocationInput,
+)=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
 }
 >()("t3code-relay/environments/ManagedEndpointAllocations"){}
 
@@ -321,6 +344,35 @@ export const make = Effect.gen(function* () {
 );
 returnclaimed;
 }),
+claimDeprovision: Effect.fn("relay.managed_endpoint_allocations.claim_deprovision")(function*(
+input: ClaimManagedEndpointDeprovisionInput,
+){
+constclaimedAt=DateTime.formatIso(yield*DateTime.now);
+constclaimed=yield*db
+.update(relayManagedEndpointAllocations)
+.set({updatedAt: claimedAt})
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "claim-deprovision",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+returnclaimed ? claimedAt : null;
+}),
 remove: Effect.fn("relay.managed_endpoint_allocations.remove")(function*(
 input: ManagedEndpointAllocationKey,
 ){
@@ -339,6 +391,32 @@ export const make = Effect.gen(function* () {
 ),
 );
 }),
+removeClaimed: Effect.fn("relay.managed_endpoint_allocations.remove_claimed")(function*(
+input: RemoveClaimedManagedEndpointAllocationInput,
+){
+returnyield*db
+.delete(relayManagedEndpointAllocations)
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "remove-claimed",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+}),
 });
 });
 

infra/relay/src/environments/ManagedEndpointProvider.test.ts

@@ -50,7 +50,9 @@ interface AllocationCall {
 |"recordDns"
 |"markReady"
 |"claimRelease"
-|"remove";
+|"claimDeprovision"
+|"remove"
+|"removeClaimed";
 readonlyinput: unknown;
 }
 
@@ -226,11 +228,31 @@ function makeAllocations(calls: AllocationCall[] = []) {
 mutate(allocationKey(input),(current)=>current);
 returntrue;
 }),
+claimDeprovision: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "claimDeprovision", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnnull;
+}
+mutate(allocationKey(input),(current)=>current);
+returnallocations.get(allocationKey(input))?.updatedAt??null;
+}),
 remove: (input)=>
 Effect.sync(()=>{
 calls.push({operation: "remove", input });
 allocations.delete(allocationKey(input));
 }),
+removeClaimed: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "removeClaimed", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnfalse;
+}
+allocations.delete(allocationKey(input));
+returntrue;
+}),
 });
 }
 
@@ -774,12 +796,54 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 },
 );
 
+it.effect("does not deprovision an allocation superseded by a concurrent relink",()=>{
+consttunnelCalls: TunnelCall[]=[];
+constdnsCalls: DnsCall[]=[];
+constallocationCalls: AllocationCall[]=[];
+constlayer=providerLayer(
+makePersistentTunnelClient(tunnelCalls),
+makeDnsClient(dnsCalls),
+makeAllocations(allocationCalls),
+);
+
+returnEffect.gen(function*(){
+constprovider=yield*ManagedEndpointProvider.ManagedEndpointProvider;
+constkey={userId: "user_ABC",environmentId: "env_ABC"}asconst;
+constrequest={
+ ...key,
+origin: {localHttpHost: "127.0.0.1",localHttpPort: 3773},
+}asconst;
+yield*provider.provision(request);
+constunlinkTarget=yield*provider.prepareDeprovision(key);
+expect(unlinkTarget).not.toBeNull();
+if(unlinkTarget===null){
+return;
+}
+
+// A relink refreshes the allocation generation after unlink captured its
+// target but before unlink begins external teardown.
+yield*provider.provision(request);
+consttunnelCallCount=tunnelCalls.length;
+constdnsCallCount=dnsCalls.length;
+constallocationCallCount=allocationCalls.length;
+
+yield*provider.deprovision({ ...key,target: unlinkTarget});
+
+expect(tunnelCalls).toHaveLength(tunnelCallCount);
+expect(dnsCalls).toHaveLength(dnsCallCount);
+expect(allocationCalls.slice(allocationCallCount).map((call)=>call.operation)).toEqual([
+"claimDeprovision",
+]);
+}).pipe(Effect.provide(layer));
+});
+
 it.effect("releases the tunnel while keeping the allocation, DNS record, and hostname",()=>{
 consttunnelCalls: TunnelCall[]=[];
 constdnsCalls: DnsCall[]=[];
@@ -1004,8 +1068,10 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
+"claimDeprovision",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 });
@@ -1046,7 +1112,7 @@ describe("ManagedEndpointProvider", () => {
 });
 yield*provider.deprovision(key);
 
-expect(allocationCalls.map((call)=>call.operation)).toContain("remove");
+expect(allocationCalls.map((call)=>call.operation)).toContain("removeClaimed");
 }).pipe(Effect.provide(layer));
 });
 

infra/relay/src/environments/EnvironmentConnector.test.ts

@@ -198,7 +198,9 @@ function makeAllocations(
 recordDns: ()=>Effect.die("unused"),
 markReady: ()=>Effect.die("unused"),
 claimRelease: ()=>Effect.die("unused"),
+claimDeprovision: ()=>Effect.die("unused"),
 remove: ()=>Effect.die("unused"),
+removeClaimed: ()=>Effect.die("unused"),
 };
 }
 

infra/relay/src/environments/EnvironmentLinker.test.ts

@@ -136,6 +136,7 @@ function testLayer(input?: {
 revokeForEnvironmentPublicKey: ()=>Effect.succeed(false),
 }),
 Layer.succeed(ManagedEndpointProvider.ManagedEndpointProvider,{
+prepareDeprovision: ()=>Effect.succeed(null),
 deprovision: input?.deprovision??(()=>Effect.void),
 release: ()=>Effect.succeed(true),
 provision: ()=>

infra/relay/src/environments/ManagedEndpointAllocations.test.ts

@@ -10,6 +10,61 @@ const layerWithDb = (db: RelayDb.RelayDb["Service"]) =>
 ManagedEndpointAllocations.layer.pipe(Layer.provide(Layer.succeed(RelayDb.RelayDb,db)));
 
 describe("ManagedEndpointAllocations",()=>{
+it.effect("returns a claim generation only when deprovision wins the allocation CAS",()=>{
+letclaimedAt: string|undefined;
+constfakeDb={
+update: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+set: (values: {readonlyupdatedAt: string})=>{
+claimedAt=values.updatedAt;
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([{userId: "user-1"}]),
+}),
+};
+},
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+constgeneration=yield*allocations.claimDeprovision({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "captured-generation",
+});
+
+expect(generation).toBe(claimedAt);
+expect(generation).not.toBeNull();
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
+it.effect("does not remove an allocation superseded after a deprovision claim",()=>{
+constfakeDb={
+delete: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([]),
+}),
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+expect(
+yield*allocations.removeClaimed({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "outdated-claim-generation",
+}),
+).toBe(false);
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
 it.effect("retains database failures with allocation operation and identity",()=>{
 constcause=newError("database unavailable");
 constfakeDb={

infra/relay/src/environments/ManagedEndpointAllocations.ts

@@ -51,7 +51,9 @@ export class ManagedEndpointAllocationPersistenceError extends Schema.TaggedErro
 "record-dns",
 "mark-ready",
 "claim-release",
+"claim-deprovision",
 "remove",
+"remove-claimed",
 ]),
 stage: Schema.Literals(["database-request","resolve-reservation"]),
 userId: Schema.String,
@@ -91,6 +93,14 @@ interface ClaimManagedEndpointReleaseInput extends ManagedEndpointAllocationKey
 readonlyupdatedAt: string;
 }
 
+interfaceClaimManagedEndpointDeprovisionInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
+interfaceRemoveClaimedManagedEndpointAllocationInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
 exportclassManagedEndpointAllocationsextendsContext.Service<
 ManagedEndpointAllocations,
 {
@@ -119,9 +129,22 @@ export class ManagedEndpointAllocations extends Context.Service<
 readonlyclaimRelease: (
 input: ClaimManagedEndpointReleaseInput,
 )=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
+/**
+ * Claims the complete allocation for teardown only if its generation still
+ * matches the snapshot captured by the unlink operation.
+ *
+ * Returns the claim generation used by `removeClaimed`, or null when a
+ * concurrent provision has already superseded the snapshot.
+ */
+readonlyclaimDeprovision: (
+input: ClaimManagedEndpointDeprovisionInput,
+)=>Effect.Effect<string|null,ManagedEndpointAllocationPersistenceError>;
 readonlyremove: (
 input: ManagedEndpointAllocationKey,
 )=>Effect.Effect<void,ManagedEndpointAllocationPersistenceError>;
+readonlyremoveClaimed: (
+input: RemoveClaimedManagedEndpointAllocationInput,
+)=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
 }
 >()("t3code-relay/environments/ManagedEndpointAllocations"){}
 
@@ -321,6 +344,35 @@ export const make = Effect.gen(function* () {
 );
 returnclaimed;
 }),
+claimDeprovision: Effect.fn("relay.managed_endpoint_allocations.claim_deprovision")(function*(
+input: ClaimManagedEndpointDeprovisionInput,
+){
+constclaimedAt=DateTime.formatIso(yield*DateTime.now);
+constclaimed=yield*db
+.update(relayManagedEndpointAllocations)
+.set({updatedAt: claimedAt})
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "claim-deprovision",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+returnclaimed ? claimedAt : null;
+}),
 remove: Effect.fn("relay.managed_endpoint_allocations.remove")(function*(
 input: ManagedEndpointAllocationKey,
 ){
@@ -339,6 +391,32 @@ export const make = Effect.gen(function* () {
 ),
 );
 }),
+removeClaimed: Effect.fn("relay.managed_endpoint_allocations.remove_claimed")(function*(
+input: RemoveClaimedManagedEndpointAllocationInput,
+){
+returnyield*db
+.delete(relayManagedEndpointAllocations)
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "remove-claimed",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+}),
 });
 });
 

infra/relay/src/environments/ManagedEndpointProvider.test.ts

@@ -50,7 +50,9 @@ interface AllocationCall {
 |"recordDns"
 |"markReady"
 |"claimRelease"
-|"remove";
+|"claimDeprovision"
+|"remove"
+|"removeClaimed";
 readonlyinput: unknown;
 }
 
@@ -226,11 +228,31 @@ function makeAllocations(calls: AllocationCall[] = []) {
 mutate(allocationKey(input),(current)=>current);
 returntrue;
 }),
+claimDeprovision: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "claimDeprovision", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnnull;
+}
+mutate(allocationKey(input),(current)=>current);
+returnallocations.get(allocationKey(input))?.updatedAt??null;
+}),
 remove: (input)=>
 Effect.sync(()=>{
 calls.push({operation: "remove", input });
 allocations.delete(allocationKey(input));
 }),
+removeClaimed: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "removeClaimed", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnfalse;
+}
+allocations.delete(allocationKey(input));
+returntrue;
+}),
 });
 }
 
@@ -774,12 +796,54 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 },
 );
 
+it.effect("does not deprovision an allocation superseded by a concurrent relink",()=>{
+consttunnelCalls: TunnelCall[]=[];
+constdnsCalls: DnsCall[]=[];
+constallocationCalls: AllocationCall[]=[];
+constlayer=providerLayer(
+makePersistentTunnelClient(tunnelCalls),
+makeDnsClient(dnsCalls),
+makeAllocations(allocationCalls),
+);
+
+returnEffect.gen(function*(){
+constprovider=yield*ManagedEndpointProvider.ManagedEndpointProvider;
+constkey={userId: "user_ABC",environmentId: "env_ABC"}asconst;
+constrequest={
+ ...key,
+origin: {localHttpHost: "127.0.0.1",localHttpPort: 3773},
+}asconst;
+yield*provider.provision(request);
+constunlinkTarget=yield*provider.prepareDeprovision(key);
+expect(unlinkTarget).not.toBeNull();
+if(unlinkTarget===null){
+return;
+}
+
+// A relink refreshes the allocation generation after unlink captured its
+// target but before unlink begins external teardown.
+yield*provider.provision(request);
+consttunnelCallCount=tunnelCalls.length;
+constdnsCallCount=dnsCalls.length;
+constallocationCallCount=allocationCalls.length;
+
+yield*provider.deprovision({ ...key,target: unlinkTarget});
+
+expect(tunnelCalls).toHaveLength(tunnelCallCount);
+expect(dnsCalls).toHaveLength(dnsCallCount);
+expect(allocationCalls.slice(allocationCallCount).map((call)=>call.operation)).toEqual([
+"claimDeprovision",
+]);
+}).pipe(Effect.provide(layer));
+});
+
 it.effect("releases the tunnel while keeping the allocation, DNS record, and hostname",()=>{
 consttunnelCalls: TunnelCall[]=[];
 constdnsCalls: DnsCall[]=[];
@@ -1004,8 +1068,10 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
+"claimDeprovision",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 });
@@ -1046,7 +1112,7 @@ describe("ManagedEndpointProvider", () => {
 });
 yield*provider.deprovision(key);
 
-expect(allocationCalls.map((call)=>call.operation)).toContain("remove");
+expect(allocationCalls.map((call)=>call.operation)).toContain("removeClaimed");
 }).pipe(Effect.provide(layer));
 });
 

infra/relay/src/environments/EnvironmentConnector.test.ts

@@ -198,7 +198,9 @@ function makeAllocations(
 recordDns: ()=>Effect.die("unused"),
 markReady: ()=>Effect.die("unused"),
 claimRelease: ()=>Effect.die("unused"),
+claimDeprovision: ()=>Effect.die("unused"),
 remove: ()=>Effect.die("unused"),
+removeClaimed: ()=>Effect.die("unused"),
 };
 }
 

infra/relay/src/environments/EnvironmentLinker.test.ts

@@ -136,6 +136,7 @@ function testLayer(input?: {
 revokeForEnvironmentPublicKey: ()=>Effect.succeed(false),
 }),
 Layer.succeed(ManagedEndpointProvider.ManagedEndpointProvider,{
+prepareDeprovision: ()=>Effect.succeed(null),
 deprovision: input?.deprovision??(()=>Effect.void),
 release: ()=>Effect.succeed(true),
 provision: ()=>

infra/relay/src/environments/ManagedEndpointAllocations.test.ts

@@ -10,6 +10,61 @@ const layerWithDb = (db: RelayDb.RelayDb["Service"]) =>
 ManagedEndpointAllocations.layer.pipe(Layer.provide(Layer.succeed(RelayDb.RelayDb,db)));
 
 describe("ManagedEndpointAllocations",()=>{
+it.effect("returns a claim generation only when deprovision wins the allocation CAS",()=>{
+letclaimedAt: string|undefined;
+constfakeDb={
+update: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+set: (values: {readonlyupdatedAt: string})=>{
+claimedAt=values.updatedAt;
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([{userId: "user-1"}]),
+}),
+};
+},
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+constgeneration=yield*allocations.claimDeprovision({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "captured-generation",
+});
+
+expect(generation).toBe(claimedAt);
+expect(generation).not.toBeNull();
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
+it.effect("does not remove an allocation superseded after a deprovision claim",()=>{
+constfakeDb={
+delete: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([]),
+}),
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+expect(
+yield*allocations.removeClaimed({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "outdated-claim-generation",
+}),
+).toBe(false);
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
 it.effect("retains database failures with allocation operation and identity",()=>{
 constcause=newError("database unavailable");
 constfakeDb={

infra/relay/src/environments/ManagedEndpointAllocations.ts

@@ -51,7 +51,9 @@ export class ManagedEndpointAllocationPersistenceError extends Schema.TaggedErro
 "record-dns",
 "mark-ready",
 "claim-release",
+"claim-deprovision",
 "remove",
+"remove-claimed",
 ]),
 stage: Schema.Literals(["database-request","resolve-reservation"]),
 userId: Schema.String,
@@ -91,6 +93,14 @@ interface ClaimManagedEndpointReleaseInput extends ManagedEndpointAllocationKey
 readonlyupdatedAt: string;
 }
 
+interfaceClaimManagedEndpointDeprovisionInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
+interfaceRemoveClaimedManagedEndpointAllocationInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
 exportclassManagedEndpointAllocationsextendsContext.Service<
 ManagedEndpointAllocations,
 {
@@ -119,9 +129,22 @@ export class ManagedEndpointAllocations extends Context.Service<
 readonlyclaimRelease: (
 input: ClaimManagedEndpointReleaseInput,
 )=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
+/**
+ * Claims the complete allocation for teardown only if its generation still
+ * matches the snapshot captured by the unlink operation.
+ *
+ * Returns the claim generation used by `removeClaimed`, or null when a
+ * concurrent provision has already superseded the snapshot.
+ */
+readonlyclaimDeprovision: (
+input: ClaimManagedEndpointDeprovisionInput,
+)=>Effect.Effect<string|null,ManagedEndpointAllocationPersistenceError>;
 readonlyremove: (
 input: ManagedEndpointAllocationKey,
 )=>Effect.Effect<void,ManagedEndpointAllocationPersistenceError>;
+readonlyremoveClaimed: (
+input: RemoveClaimedManagedEndpointAllocationInput,
+)=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
 }
 >()("t3code-relay/environments/ManagedEndpointAllocations"){}
 
@@ -321,6 +344,35 @@ export const make = Effect.gen(function* () {
 );
 returnclaimed;
 }),
+claimDeprovision: Effect.fn("relay.managed_endpoint_allocations.claim_deprovision")(function*(
+input: ClaimManagedEndpointDeprovisionInput,
+){
+constclaimedAt=DateTime.formatIso(yield*DateTime.now);
+constclaimed=yield*db
+.update(relayManagedEndpointAllocations)
+.set({updatedAt: claimedAt})
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "claim-deprovision",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+returnclaimed ? claimedAt : null;
+}),
 remove: Effect.fn("relay.managed_endpoint_allocations.remove")(function*(
 input: ManagedEndpointAllocationKey,
 ){
@@ -339,6 +391,32 @@ export const make = Effect.gen(function* () {
 ),
 );
 }),
+removeClaimed: Effect.fn("relay.managed_endpoint_allocations.remove_claimed")(function*(
+input: RemoveClaimedManagedEndpointAllocationInput,
+){
+returnyield*db
+.delete(relayManagedEndpointAllocations)
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "remove-claimed",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+}),
 });
 });
 

infra/relay/src/environments/ManagedEndpointProvider.test.ts

@@ -50,7 +50,9 @@ interface AllocationCall {
 |"recordDns"
 |"markReady"
 |"claimRelease"
-|"remove";
+|"claimDeprovision"
+|"remove"
+|"removeClaimed";
 readonlyinput: unknown;
 }
 
@@ -226,11 +228,31 @@ function makeAllocations(calls: AllocationCall[] = []) {
 mutate(allocationKey(input),(current)=>current);
 returntrue;
 }),
+claimDeprovision: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "claimDeprovision", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnnull;
+}
+mutate(allocationKey(input),(current)=>current);
+returnallocations.get(allocationKey(input))?.updatedAt??null;
+}),
 remove: (input)=>
 Effect.sync(()=>{
 calls.push({operation: "remove", input });
 allocations.delete(allocationKey(input));
 }),
+removeClaimed: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "removeClaimed", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnfalse;
+}
+allocations.delete(allocationKey(input));
+returntrue;
+}),
 });
 }
 
@@ -774,12 +796,54 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 },
 );
 
+it.effect("does not deprovision an allocation superseded by a concurrent relink",()=>{
+consttunnelCalls: TunnelCall[]=[];
+constdnsCalls: DnsCall[]=[];
+constallocationCalls: AllocationCall[]=[];
+constlayer=providerLayer(
+makePersistentTunnelClient(tunnelCalls),
+makeDnsClient(dnsCalls),
+makeAllocations(allocationCalls),
+);
+
+returnEffect.gen(function*(){
+constprovider=yield*ManagedEndpointProvider.ManagedEndpointProvider;
+constkey={userId: "user_ABC",environmentId: "env_ABC"}asconst;
+constrequest={
+ ...key,
+origin: {localHttpHost: "127.0.0.1",localHttpPort: 3773},
+}asconst;
+yield*provider.provision(request);
+constunlinkTarget=yield*provider.prepareDeprovision(key);
+expect(unlinkTarget).not.toBeNull();
+if(unlinkTarget===null){
+return;
+}
+
+// A relink refreshes the allocation generation after unlink captured its
+// target but before unlink begins external teardown.
+yield*provider.provision(request);
+consttunnelCallCount=tunnelCalls.length;
+constdnsCallCount=dnsCalls.length;
+constallocationCallCount=allocationCalls.length;
+
+yield*provider.deprovision({ ...key,target: unlinkTarget});
+
+expect(tunnelCalls).toHaveLength(tunnelCallCount);
+expect(dnsCalls).toHaveLength(dnsCallCount);
+expect(allocationCalls.slice(allocationCallCount).map((call)=>call.operation)).toEqual([
+"claimDeprovision",
+]);
+}).pipe(Effect.provide(layer));
+});
+
 it.effect("releases the tunnel while keeping the allocation, DNS record, and hostname",()=>{
 consttunnelCalls: TunnelCall[]=[];
 constdnsCalls: DnsCall[]=[];
@@ -1004,8 +1068,10 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
+"claimDeprovision",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 });
@@ -1046,7 +1112,7 @@ describe("ManagedEndpointProvider", () => {
 });
 yield*provider.deprovision(key);
 
-expect(allocationCalls.map((call)=>call.operation)).toContain("remove");
+expect(allocationCalls.map((call)=>call.operation)).toContain("removeClaimed");
 }).pipe(Effect.provide(layer));
 });
 

infra/relay/src/environments/EnvironmentConnector.test.ts

@@ -198,7 +198,9 @@ function makeAllocations(
 recordDns: ()=>Effect.die("unused"),
 markReady: ()=>Effect.die("unused"),
 claimRelease: ()=>Effect.die("unused"),
+claimDeprovision: ()=>Effect.die("unused"),
 remove: ()=>Effect.die("unused"),
+removeClaimed: ()=>Effect.die("unused"),
 };
 }
 

infra/relay/src/environments/EnvironmentLinker.test.ts

@@ -136,6 +136,7 @@ function testLayer(input?: {
 revokeForEnvironmentPublicKey: ()=>Effect.succeed(false),
 }),
 Layer.succeed(ManagedEndpointProvider.ManagedEndpointProvider,{
+prepareDeprovision: ()=>Effect.succeed(null),
 deprovision: input?.deprovision??(()=>Effect.void),
 release: ()=>Effect.succeed(true),
 provision: ()=>

infra/relay/src/environments/ManagedEndpointAllocations.test.ts

@@ -10,6 +10,61 @@ const layerWithDb = (db: RelayDb.RelayDb["Service"]) =>
 ManagedEndpointAllocations.layer.pipe(Layer.provide(Layer.succeed(RelayDb.RelayDb,db)));
 
 describe("ManagedEndpointAllocations",()=>{
+it.effect("returns a claim generation only when deprovision wins the allocation CAS",()=>{
+letclaimedAt: string|undefined;
+constfakeDb={
+update: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+set: (values: {readonlyupdatedAt: string})=>{
+claimedAt=values.updatedAt;
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([{userId: "user-1"}]),
+}),
+};
+},
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+constgeneration=yield*allocations.claimDeprovision({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "captured-generation",
+});
+
+expect(generation).toBe(claimedAt);
+expect(generation).not.toBeNull();
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
+it.effect("does not remove an allocation superseded after a deprovision claim",()=>{
+constfakeDb={
+delete: (table: unknown)=>{
+expect(table).toBe(relayManagedEndpointAllocations);
+return{
+where: ()=>({
+returning: ()=>Effect.succeed([]),
+}),
+};
+},
+}asunknownasRelayDb.RelayDb["Service"];
+
+returnEffect.gen(function*(){
+constallocations=yield*ManagedEndpointAllocations.ManagedEndpointAllocations;
+expect(
+yield*allocations.removeClaimed({
+userId: "user-1",
+environmentId: "environment-1",
+updatedAt: "outdated-claim-generation",
+}),
+).toBe(false);
+}).pipe(Effect.provide(layerWithDb(fakeDb)));
+});
+
 it.effect("retains database failures with allocation operation and identity",()=>{
 constcause=newError("database unavailable");
 constfakeDb={

infra/relay/src/environments/ManagedEndpointAllocations.ts

@@ -51,7 +51,9 @@ export class ManagedEndpointAllocationPersistenceError extends Schema.TaggedErro
 "record-dns",
 "mark-ready",
 "claim-release",
+"claim-deprovision",
 "remove",
+"remove-claimed",
 ]),
 stage: Schema.Literals(["database-request","resolve-reservation"]),
 userId: Schema.String,
@@ -91,6 +93,14 @@ interface ClaimManagedEndpointReleaseInput extends ManagedEndpointAllocationKey
 readonlyupdatedAt: string;
 }
 
+interfaceClaimManagedEndpointDeprovisionInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
+interfaceRemoveClaimedManagedEndpointAllocationInputextendsManagedEndpointAllocationKey{
+readonlyupdatedAt: string;
+}
+
 exportclassManagedEndpointAllocationsextendsContext.Service<
 ManagedEndpointAllocations,
 {
@@ -119,9 +129,22 @@ export class ManagedEndpointAllocations extends Context.Service<
 readonlyclaimRelease: (
 input: ClaimManagedEndpointReleaseInput,
 )=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
+/**
+ * Claims the complete allocation for teardown only if its generation still
+ * matches the snapshot captured by the unlink operation.
+ *
+ * Returns the claim generation used by `removeClaimed`, or null when a
+ * concurrent provision has already superseded the snapshot.
+ */
+readonlyclaimDeprovision: (
+input: ClaimManagedEndpointDeprovisionInput,
+)=>Effect.Effect<string|null,ManagedEndpointAllocationPersistenceError>;
 readonlyremove: (
 input: ManagedEndpointAllocationKey,
 )=>Effect.Effect<void,ManagedEndpointAllocationPersistenceError>;
+readonlyremoveClaimed: (
+input: RemoveClaimedManagedEndpointAllocationInput,
+)=>Effect.Effect<boolean,ManagedEndpointAllocationPersistenceError>;
 }
 >()("t3code-relay/environments/ManagedEndpointAllocations"){}
 
@@ -321,6 +344,35 @@ export const make = Effect.gen(function* () {
 );
 returnclaimed;
 }),
+claimDeprovision: Effect.fn("relay.managed_endpoint_allocations.claim_deprovision")(function*(
+input: ClaimManagedEndpointDeprovisionInput,
+){
+constclaimedAt=DateTime.formatIso(yield*DateTime.now);
+constclaimed=yield*db
+.update(relayManagedEndpointAllocations)
+.set({updatedAt: claimedAt})
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "claim-deprovision",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+returnclaimed ? claimedAt : null;
+}),
 remove: Effect.fn("relay.managed_endpoint_allocations.remove")(function*(
 input: ManagedEndpointAllocationKey,
 ){
@@ -339,6 +391,32 @@ export const make = Effect.gen(function* () {
 ),
 );
 }),
+removeClaimed: Effect.fn("relay.managed_endpoint_allocations.remove_claimed")(function*(
+input: RemoveClaimedManagedEndpointAllocationInput,
+){
+returnyield*db
+.delete(relayManagedEndpointAllocations)
+.where(
+and(
+whereAllocation(input),
+eq(relayManagedEndpointAllocations.updatedAt,input.updatedAt),
+),
+)
+.returning({userId: relayManagedEndpointAllocations.userId})
+.pipe(
+Effect.map((rows)=>rows.length>0),
+Effect.mapError(
+(cause)=>
+newManagedEndpointAllocationPersistenceError({
+operation: "remove-claimed",
+stage: "database-request",
+userId: input.userId,
+environmentId: input.environmentId,
+ cause,
+}),
+),
+);
+}),
 });
 });
 

infra/relay/src/environments/ManagedEndpointProvider.test.ts

@@ -50,7 +50,9 @@ interface AllocationCall {
 |"recordDns"
 |"markReady"
 |"claimRelease"
-|"remove";
+|"claimDeprovision"
+|"remove"
+|"removeClaimed";
 readonlyinput: unknown;
 }
 
@@ -226,11 +228,31 @@ function makeAllocations(calls: AllocationCall[] = []) {
 mutate(allocationKey(input),(current)=>current);
 returntrue;
 }),
+claimDeprovision: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "claimDeprovision", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnnull;
+}
+mutate(allocationKey(input),(current)=>current);
+returnallocations.get(allocationKey(input))?.updatedAt??null;
+}),
 remove: (input)=>
 Effect.sync(()=>{
 calls.push({operation: "remove", input });
 allocations.delete(allocationKey(input));
 }),
+removeClaimed: (input)=>
+Effect.sync(()=>{
+calls.push({operation: "removeClaimed", input });
+constallocation=allocations.get(allocationKey(input));
+if(allocation===undefined||allocation.updatedAt!==input.updatedAt){
+returnfalse;
+}
+allocations.delete(allocationKey(input));
+returntrue;
+}),
 });
 }
 
@@ -774,12 +796,54 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 },
 );
 
+it.effect("does not deprovision an allocation superseded by a concurrent relink",()=>{
+consttunnelCalls: TunnelCall[]=[];
+constdnsCalls: DnsCall[]=[];
+constallocationCalls: AllocationCall[]=[];
+constlayer=providerLayer(
+makePersistentTunnelClient(tunnelCalls),
+makeDnsClient(dnsCalls),
+makeAllocations(allocationCalls),
+);
+
+returnEffect.gen(function*(){
+constprovider=yield*ManagedEndpointProvider.ManagedEndpointProvider;
+constkey={userId: "user_ABC",environmentId: "env_ABC"}asconst;
+constrequest={
+ ...key,
+origin: {localHttpHost: "127.0.0.1",localHttpPort: 3773},
+}asconst;
+yield*provider.provision(request);
+constunlinkTarget=yield*provider.prepareDeprovision(key);
+expect(unlinkTarget).not.toBeNull();
+if(unlinkTarget===null){
+return;
+}
+
+// A relink refreshes the allocation generation after unlink captured its
+// target but before unlink begins external teardown.
+yield*provider.provision(request);
+consttunnelCallCount=tunnelCalls.length;
+constdnsCallCount=dnsCalls.length;
+constallocationCallCount=allocationCalls.length;
+
+yield*provider.deprovision({ ...key,target: unlinkTarget});
+
+expect(tunnelCalls).toHaveLength(tunnelCallCount);
+expect(dnsCalls).toHaveLength(dnsCallCount);
+expect(allocationCalls.slice(allocationCallCount).map((call)=>call.operation)).toEqual([
+"claimDeprovision",
+]);
+}).pipe(Effect.provide(layer));
+});
+
 it.effect("releases the tunnel while keeping the allocation, DNS record, and hostname",()=>{
 consttunnelCalls: TunnelCall[]=[];
 constdnsCalls: DnsCall[]=[];
@@ -1004,8 +1068,10 @@ describe("ManagedEndpointProvider", () => {
 "recordDns",
 "markReady",
 "get",
+"claimDeprovision",
 "get",
-"remove",
+"claimDeprovision",
+"removeClaimed",
 ]);
 }).pipe(Effect.provide(layer));
 });
@@ -1046,7 +1112,7 @@ describe("ManagedEndpointProvider", () => {
 });
 yield*provider.deprovision(key);
 
-expect(allocationCalls.map((call)=>call.operation)).toContain("remove");
+expect(allocationCalls.map((call)=>call.operation)).toContain("removeClaimed");
 }).pipe(Effect.provide(layer));
 });