feat(router): idea-board -> project-profile promotion (E)

Promote an auto-captured idea from the cross-session board into the curated per-repo
profile at <workspaceRoot>/.correx/project.toml as a `conventions` entry. New
IdeaPromotedEvent tombstones the idea off the board (IdeaReader treats it like a
discard) and records the promotion as a fact; the server PromoteIdea handler loads
the profile, appends the idea text (deduped via ProjectProfile.withConvention), and
writes it back. Adds ProjectProfileWriter (escape-aware TOML serialize/write) and
makes SimpleToml's reader unescape \\ and \" symmetrically with the writers
(fixes a pre-existing read/write asymmetry surfaced by the round-trip test).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/server/src/main/kotlin/com/correx/apps/server/protocol/ClientMessage.kt

@@ -56,6 +56,14 @@ sealed class ClientMessage {
     @Serializable
     data class DiscardIdea(val ideaId: String) : ClientMessage()
 
+    /**
+     * Operator request to promote an idea into the bound session's curated project profile (added as
+     * a `conventions` entry in `<workspaceRoot>/.correx/project.toml`). Tombstones the idea like a
+     * discard; reply is a fresh IdeaList.
+     */
+    @Serializable
+    data class PromoteIdea(val ideaId: String) : ClientMessage()
+
     /** Operator request for the current editable config (replied to with a ConfigSnapshot). */
     @Serializable
     data object GetConfig : ClientMessage()

apps/server/src/main/kotlin/com/correx/apps/server/ws/GlobalStreamHandler.kt

@@ -19,6 +19,7 @@ import com.correx.core.events.events.ApprovalGrantCreatedEvent
 import com.correx.core.events.events.ChatSessionStartedEvent
 import com.correx.core.events.events.EventMetadata
 import com.correx.core.events.events.IdeaDiscardedEvent
+import com.correx.core.events.events.IdeaPromotedEvent
 import com.correx.core.events.events.InitialIntentEvent
 import com.correx.core.events.events.NewEvent
 import com.correx.core.events.events.SessionWorkspaceBoundEvent
@@ -30,6 +31,9 @@ import com.correx.core.events.types.SessionId
 import com.correx.core.events.types.StageId
 import com.correx.core.inference.ProviderHealth
 import com.correx.core.kernel.orchestration.WorkspaceContext
+import com.correx.core.config.ProjectProfileLoader
+import com.correx.core.config.ProjectProfileWriter
+import com.correx.core.config.withConvention
 import com.correx.core.router.IdeaReader
 import com.correx.core.utils.TypeId
 import com.correx.infrastructure.inference.commons.ResourceProbe
@@ -233,6 +237,7 @@ class GlobalStreamHandler(private val module: ServerModule) {
             is ClientMessage.ListArtifacts -> sendFrame(queries.listArtifacts(msg.sessionId))
             is ClientMessage.ListIdeas -> sendFrame(queries.listIdeas())
             is ClientMessage.DiscardIdea -> handleDiscardIdea(msg, sendFrame)
+            is ClientMessage.PromoteIdea -> handlePromoteIdea(msg, sendFrame)
             is ClientMessage.GetSessionStats -> sendFrame(queries.sessionStats(msg.sessionId))
             is ClientMessage.GetConfig -> sendFrame(queries.configSnapshot(error = null, restartRequired = emptyList()))
             is ClientMessage.UpdateConfig -> sendFrame(queries.updateConfig(msg.patch))
@@ -336,6 +341,57 @@ class GlobalStreamHandler(private val module: ServerModule) {
         sendFrame(queries.listIdeas())
     }
 
+    // Promote an idea into the bound session's curated project profile (a `conventions` entry in
+    // <workspaceRoot>/.correx/project.toml), then tombstone it like a discard so it leaves the board.
+    // No-ops (just refresh the board) when the idea is missing or its capturing session has no bound
+    // workspace — promotion needs a workspace to write the profile into.
+    private suspend fun handlePromoteIdea(
+        msg: ClientMessage.PromoteIdea,
+        sendFrame: suspend (ServerMessage) -> Unit,
+    ) {
+        runCatching {
+            val reader = IdeaReader(module.eventStore)
+            val sessionId = reader.sessionOf(msg.ideaId) ?: return@runCatching
+            val text = reader.textOf(msg.ideaId) ?: return@runCatching
+            val workspaceRoot = workspaceRootOf(sessionId) ?: return@runCatching
+
+            withContext(Dispatchers.IO) {
+                val updated = ProjectProfileLoader.load(workspaceRoot).withConvention(text)
+                ProjectProfileWriter.write(workspaceRoot, updated)
+            }
+
+            module.eventStore.append(
+                NewEvent(
+                    metadata = EventMetadata(
+                        eventId = EventId(UUID.randomUUID().toString()),
+                        sessionId = sessionId,
+                        timestamp = Clock.System.now(),
+                        schemaVersion = 1,
+                        causationId = null,
+                        correlationId = null,
+                    ),
+                    payload = IdeaPromotedEvent(
+                        ideaId = msg.ideaId,
+                        sessionId = sessionId,
+                        text = text,
+                        timestampMs = System.currentTimeMillis(),
+                    ),
+                ),
+            )
+        }.onFailure {
+            log.error("promoteIdea failed for ideaId={}: {}", msg.ideaId, it.message, it)
+        }
+        sendFrame(queries.listIdeas())
+    }
+
+    // The workspace a session was bound to, from its latest SessionWorkspaceBoundEvent (invariant #9),
+    // or null if the session never bound one.
+    private fun workspaceRootOf(sessionId: SessionId): String? =
+        module.eventStore.read(sessionId)
+            .mapNotNull { it.payload as? SessionWorkspaceBoundEvent }
+            .lastOrNull()
+            ?.workspaceRoot
+
     private fun errorResponse(message: String) = ServerMessage.ProtocolError(message)
 
     private fun encodeError(message: String): Frame.Text =

apps/server/src/test/kotlin/com/correx/apps/server/protocol/ServerMessageSerializationTest.kt

@@ -267,6 +267,14 @@ class ServerMessageSerializationTest {
         assertEquals("i1", (decoded as ClientMessage.DiscardIdea).ideaId)
     }
 
+    @Test
+    fun `PromoteIdea decodes from the client wire format`() {
+        val wire = """{"type":"com.correx.apps.server.protocol.ClientMessage.PromoteIdea","ideaId":"i1"}"""
+        val decoded = ProtocolSerializer.decodeClientMessage(wire)
+        assert(decoded is ClientMessage.PromoteIdea) { "expected PromoteIdea, got $decoded" }
+        assertEquals("i1", (decoded as ClientMessage.PromoteIdea).ideaId)
+    }
+
     @Test
     fun `ClarificationResponse decodes from the client wire format`() {
         val wire = """

core/config/src/main/kotlin/com/correx/core/config/ConfigLoader.kt

@@ -57,8 +57,11 @@ internal object SimpleToml {
         var depth = 0
         var inQuotes = false
         var quoteChar = ' '
+        var escaped = false
         for (ch in value) {
             when {
+                escaped -> escaped = false
+                ch == '\\' && inQuotes && quoteChar == '"' -> escaped = true
                 (ch == '"' || ch == '\'') && !inQuotes -> { inQuotes = true; quoteChar = ch }
                 ch == quoteChar && inQuotes -> inQuotes = false
                 ch == '[' && !inQuotes -> depth++
@@ -92,8 +95,13 @@ internal object SimpleToml {
         var current = StringBuilder()
         var inQuotes = false
         var quoteChar = ' '
+        var escaped = false
         for (ch in content) {
             when {
+                // Keep escape sequences (e.g. \") intact so they reach stripQuotes verbatim; an
+                // escaped quote must not be treated as the string's closing delimiter.
+                escaped -> { current.append(ch); escaped = false }
+                ch == '\\' && inQuotes && quoteChar == '"' -> { current.append(ch); escaped = true }
                 (ch == '"' || ch == '\'') && !inQuotes -> { inQuotes = true; quoteChar = ch; current.append(ch) }
                 ch == quoteChar && inQuotes -> { inQuotes = false; current.append(ch) }
                 ch == ',' && !inQuotes -> { result.add(stripQuotes(current.toString().trim())); current = StringBuilder() }
@@ -104,10 +112,39 @@ internal object SimpleToml {
         return result
     }
 
+    /**
+     * Strips the surrounding quotes from [value] and, for double-quoted strings, unescapes the
+     * `\\` and `\"` sequences emitted by the writers (mirrors [ProjectProfileWriter]/[CorrexConfigWriter]).
+     */
     private fun stripQuotes(value: String): String {
-        val isDoubleQuoted = value.startsWith("\"") && value.endsWith("\"")
-        val isSingleQuoted = value.startsWith("'") && value.endsWith("'")
-        return if (isDoubleQuoted || isSingleQuoted) value.substring(1, value.length - 1) else value
+        val isDoubleQuoted = value.startsWith("\"") && value.endsWith("\"") && value.length >= 2
+        val isSingleQuoted = value.startsWith("'") && value.endsWith("'") && value.length >= 2
+        return when {
+            isDoubleQuoted -> unescapeDoubleQuoted(value.substring(1, value.length - 1))
+            isSingleQuoted -> value.substring(1, value.length - 1)
+            else -> value
+        }
+    }
+
+    /** Reverses the writer's escaping: `\\` -> `\`, `\"` -> `"`; a trailing lone `\` is kept as-is. */
+    private fun unescapeDoubleQuoted(value: String): String {
+        if ('\\' !in value) return value
+        val sb = StringBuilder(value.length)
+        var i = 0
+        while (i < value.length) {
+            val ch = value[i]
+            if (ch == '\\' && i + 1 < value.length) {
+                val next = value[i + 1]
+                if (next == '\\' || next == '"') {
+                    sb.append(next)
+                    i += 2
+                    continue
+                }
+            }
+            sb.append(ch)
+            i++
+        }
+        return sb.toString()
     }
 }
 

core/config/src/main/kotlin/com/correx/core/config/ProjectProfileWriter.kt

@@ -0,0 +1,64 @@
+package com.correx.core.config
+
+import java.nio.file.Files
+
+/**
+ * Serializes a [ProjectProfile] back to TOML text that [ProjectProfileLoader] reads identically:
+ * the invariant is `load(write(profile)) == profile` for every field the loader understands
+ * (about, conventions, commands).
+ *
+ * Like [CorrexConfigWriter] this **regenerates** the file from the profile object — it does not
+ * preserve hand-written comments. Empty sections are skipped: a blank `about` and an empty
+ * `conventions`/`commands` produce no output for that part (the loader reconstructs the defaults
+ * from their absence), so a [ProjectProfile.isEmpty] profile serializes to an empty string.
+ */
+object ProjectProfileWriter {
+
+    /** Renders [profile] as TOML. String values escape `\` and `"`; empty sections are skipped. */
+    fun serialize(profile: ProjectProfile): String {
+        val b = StringBuilder()
+
+        if (profile.about.isNotBlank()) {
+            b.append("about = ").append(str(profile.about)).append('\n')
+        }
+
+        if (profile.conventions.isNotEmpty()) {
+            b.append("conventions = ").append(list(profile.conventions)).append('\n')
+        }
+
+        if (profile.commands.isNotEmpty()) {
+            if (b.isNotEmpty()) b.append('\n')
+            b.append("[commands]\n")
+            profile.commands.forEach { (key, value) ->
+                b.append(key).append(" = ").append(str(value)).append('\n')
+            }
+        }
+
+        return b.toString()
+    }
+
+    /**
+     * Writes [profile] to `<workspaceRoot>/.correx/project.toml`, creating the `.correx/` directory
+     * if it is missing. Overwrites any existing file (the writer owns the file once a save happens).
+     */
+    fun write(workspaceRoot: String, profile: ProjectProfile) {
+        val path = ProjectProfileLoader.profilePath(workspaceRoot)
+        Files.createDirectories(path.parent)
+        Files.writeString(path, serialize(profile))
+    }
+
+    private fun str(v: String): String = "\"" + v.replace("\\", "\\\\").replace("\"", "\\\"") + "\""
+
+    private fun list(v: List<String>): String = "[" + v.joinToString(", ") { str(it) } + "]"
+}
+
+/**
+ * Appends [text] to this profile's conventions, de-duplicated by exact string match. A blank
+ * [text] is ignored (returns the profile unchanged). Used when promoting an idea-board entry into
+ * the curated profile so repeated promotions of the same text don't pile up duplicate conventions.
+ */
+fun ProjectProfile.withConvention(text: String): ProjectProfile {
+    val trimmed = text.trim()
+    if (trimmed.isBlank() || trimmed in conventions) return this
+    return copy(conventions = conventions + trimmed)
+}

core/config/src/test/kotlin/com/correx/core/config/ProjectProfileWriterTest.kt

@@ -0,0 +1,79 @@
+package com.correx.core.config
+
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertFalse
+import org.junit.jupiter.api.Assertions.assertSame
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.io.TempDir
+import java.nio.file.Path
+
+class ProjectProfileWriterTest {
+
+    @TempDir
+    lateinit var tempDir: Path
+
+    @Test
+    fun `write then load round-trips about conventions and commands including embedded quotes`() {
+        val profile = ProjectProfile(
+            about = "Event-sourced kernel \"the\" orchestrator, Kotlin/JVM 21",
+            conventions = listOf(
+                "no bare try-catch",
+                "prefer the \"narrow\" interface", // a convention with a double-quote
+            ),
+            commands = mapOf(
+                "build" to "./gradlew build",
+                "test" to "./gradlew check",
+            ),
+        )
+
+        ProjectProfileWriter.write(tempDir.toString(), profile)
+        val loaded = ProjectProfileLoader.load(tempDir.toString())
+
+        assertEquals(profile.about, loaded.about)
+        assertEquals(profile.conventions, loaded.conventions)
+        assertEquals(profile.commands, loaded.commands)
+        assertEquals(profile, loaded)
+    }
+
+    @Test
+    fun `an empty profile serializes to an empty string and skips empty sections`() {
+        val serialized = ProjectProfileWriter.serialize(ProjectProfile())
+        assertEquals("", serialized)
+        assertFalse(serialized.contains("[commands]"))
+    }
+
+    @Test
+    fun `blank about is omitted but conventions and commands are still written`() {
+        val serialized = ProjectProfileWriter.serialize(
+            ProjectProfile(
+                about = "   ",
+                conventions = listOf("c1"),
+                commands = mapOf("run" to "x"),
+            ),
+        )
+        assertFalse(serialized.contains("about ="), "blank about must be skipped")
+        assertTrue(serialized.contains("conventions = [\"c1\"]"))
+        assertTrue(serialized.contains("[commands]"))
+    }
+
+    @Test
+    fun `withConvention appends a new convention`() {
+        val updated = ProjectProfile(conventions = listOf("a")).withConvention("b")
+        assertEquals(listOf("a", "b"), updated.conventions)
+    }
+
+    @Test
+    fun `withConvention de-dupes an exact existing convention`() {
+        val profile = ProjectProfile(conventions = listOf("no bare try-catch"))
+        val updated = profile.withConvention("no bare try-catch")
+        assertSame(profile, updated, "an exact duplicate must return the same profile unchanged")
+        assertEquals(listOf("no bare try-catch"), updated.conventions)
+    }
+
+    @Test
+    fun `withConvention ignores blank text`() {
+        val profile = ProjectProfile(conventions = listOf("a"))
+        assertSame(profile, profile.withConvention("   "))
+    }
+}

core/events/src/main/kotlin/com/correx/core/events/events/IdeaEvents.kt

@@ -31,3 +31,19 @@ data class IdeaDiscardedEvent(
     val ideaId: String,
     val sessionId: SessionId,
 ) : EventPayload
+
+/**
+ * The operator promoted an idea from the cross-session board into the curated per-repo profile
+ * (`<workspaceRoot>/.correx/project.toml`, as a `conventions` entry). Like [IdeaDiscardedEvent] this
+ * is a tombstone — the original [IdeaCapturedEvent] stays in the log (and replays), but the idea-board
+ * projection filters out any promoted [ideaId]. [sessionId] is the capturing session (so all of one
+ * idea's events stay co-located); [text] records the convention text written to the profile.
+ */
+@Serializable
+@SerialName("IdeaPromoted")
+data class IdeaPromotedEvent(
+    val ideaId: String,
+    val sessionId: SessionId,
+    val text: String,
+    val timestampMs: Long,
+) : EventPayload

core/events/src/main/kotlin/com/correx/core/events/serialization/Serialization.kt

@@ -29,6 +29,7 @@ import com.correx.core.events.events.HealthDegradedEvent
 import com.correx.core.events.events.HealthRestoredEvent
 import com.correx.core.events.events.IdeaCapturedEvent
 import com.correx.core.events.events.IdeaDiscardedEvent
+import com.correx.core.events.events.IdeaPromotedEvent
 import com.correx.core.events.events.JournalCompactedEvent
 import com.correx.core.events.events.FileWrittenEvent
 import com.correx.core.events.events.L3MemoryRetrievedEvent
@@ -137,6 +138,7 @@ val eventModule = SerializersModule {
         subclass(WorkflowProposedEvent::class)
         subclass(IdeaCapturedEvent::class)
         subclass(IdeaDiscardedEvent::class)
+        subclass(IdeaPromotedEvent::class)
         subclass(CritiqueOutcomeCorrelatedEvent::class)
         subclass(StageCheckpointPassedEvent::class)
         subclass(StageCheckpointFailedEvent::class)

core/events/src/test/kotlin/com/correx/core/events/EventSerializationHardeningTest.kt

@@ -6,6 +6,7 @@ import com.correx.core.approvals.Tier
 import com.correx.core.events.events.ApprovalDecisionResolvedEvent
 import com.correx.core.events.events.ApprovalRequestedEvent
 import com.correx.core.events.events.EventPayload
+import com.correx.core.events.events.IdeaPromotedEvent
 import com.correx.core.events.events.OrchestrationPausedEvent
 import com.correx.core.events.events.RiskAssessedEvent
 import com.correx.core.events.events.SteeringNoteAddedEvent
@@ -81,6 +82,12 @@ class EventSerializationHardeningTest {
             terminalStageId = stageId,
             totalStages = 1,
         ),
+        "IdeaPromoted" to IdeaPromotedEvent(
+            ideaId = "idea-1",
+            sessionId = sessionId,
+            text = "cache the repo map across sessions",
+            timestampMs = 1_700_000_000_000,
+        ),
     )
 
     @Test

core/router/src/main/kotlin/com/correx/core/router/IdeaReader.kt

@@ -2,6 +2,7 @@ package com.correx.core.router
 
 import com.correx.core.events.events.IdeaCapturedEvent
 import com.correx.core.events.events.IdeaDiscardedEvent
+import com.correx.core.events.events.IdeaPromotedEvent
 import com.correx.core.events.stores.EventStore
 import com.correx.core.events.types.SessionId
 import com.correx.core.router.model.Idea
@@ -10,28 +11,36 @@ import com.correx.core.router.model.Idea
  * Rebuilds the operator's idea board from the event log. Cross-session by design: it folds over
  * [EventStore.allEvents] rather than a single session's replay, so an idea captured in one session
  * shows on the board (and feeds the router) in every session. A captured idea is dropped once a
- * matching [IdeaDiscardedEvent] tombstones it (invariant #1 — the capture stays in the log).
+ * matching [IdeaDiscardedEvent] (or [IdeaPromotedEvent]) tombstones it (invariant #1 — the capture
+ * stays in the log).
  */
 class IdeaReader(private val eventStore: EventStore) {
 
-    /** Active ideas (captured, not later discarded) across all sessions, newest first. */
+    /** Active ideas (captured, not later discarded or promoted) across all sessions, newest first. */
     fun activeIdeas(): List<Idea> {
-        val discarded = mutableSetOf<String>()
+        val tombstoned = mutableSetOf<String>()
         val captured = mutableListOf<Idea>()
         eventStore.allEvents().forEach { stored ->
             when (val payload = stored.payload) {
-                is IdeaDiscardedEvent -> discarded += payload.ideaId
+                is IdeaDiscardedEvent -> tombstoned += payload.ideaId
+                is IdeaPromotedEvent -> tombstoned += payload.ideaId
                 is IdeaCapturedEvent -> captured += Idea(payload.ideaId, payload.text, payload.timestampMs)
                 else -> Unit
             }
         }
-        return captured.filterNot { it.id in discarded }.sortedByDescending { it.capturedAtMs }
+        return captured.filterNot { it.id in tombstoned }.sortedByDescending { it.capturedAtMs }
     }
 
-    /** The session that captured [ideaId], so a discard tombstone lands alongside its capture. */
+    /** The session that captured [ideaId], so a tombstone lands alongside its capture. */
     fun sessionOf(ideaId: String): SessionId? =
+        capturedOf(ideaId)?.sessionId
+
+    /** The captured text of [ideaId] (so a promotion can write it into the project profile), or null. */
+    fun textOf(ideaId: String): String? =
+        capturedOf(ideaId)?.text
+
+    private fun capturedOf(ideaId: String): IdeaCapturedEvent? =
         eventStore.allEvents()
             .mapNotNull { it.payload as? IdeaCapturedEvent }
             .firstOrNull { it.ideaId == ideaId }
-            ?.sessionId
 }

core/router/src/test/kotlin/com/correx/core/router/IdeaReaderTest.kt

@@ -0,0 +1,100 @@
+package com.correx.core.router
+
+import com.correx.core.events.events.EventMetadata
+import com.correx.core.events.events.EventPayload
+import com.correx.core.events.events.IdeaCapturedEvent
+import com.correx.core.events.events.IdeaDiscardedEvent
+import com.correx.core.events.events.IdeaPromotedEvent
+import com.correx.core.events.events.NewEvent
+import com.correx.core.events.events.StoredEvent
+import com.correx.core.events.stores.EventStore
+import com.correx.core.events.types.EventId
+import com.correx.core.events.types.SessionId
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.emptyFlow
+import kotlinx.datetime.Instant
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertFalse
+import org.junit.jupiter.api.Assertions.assertNull
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Test
+
+class IdeaReaderTest {
+
+    private val session = SessionId("s-1")
+
+    @Test
+    fun `a promoted idea is filtered out of the board like a discard`() {
+        val store = fakeStore(
+            IdeaCapturedEvent("keep", session, "cache the repo map", timestampMs = 1),
+            IdeaCapturedEvent("promoted", session, "no bare try-catch", timestampMs = 2),
+            IdeaCapturedEvent("discarded", session, "old note", timestampMs = 3),
+            IdeaPromotedEvent("promoted", session, "no bare try-catch", timestampMs = 99),
+            IdeaDiscardedEvent("discarded", session),
+        )
+
+        val active = IdeaReader(store).activeIdeas()
+
+        assertEquals(listOf("keep"), active.map { it.id })
+        assertFalse(active.any { it.id == "promoted" }, "promoted idea must leave the board")
+        assertFalse(active.any { it.id == "discarded" }, "discarded idea must leave the board")
+    }
+
+    @Test
+    fun `textOf returns the captured text and null for an unknown idea`() {
+        val store = fakeStore(
+            IdeaCapturedEvent("i1", session, "events are the only source of truth", timestampMs = 1),
+        )
+        val reader = IdeaReader(store)
+
+        assertEquals("events are the only source of truth", reader.textOf("i1"))
+        assertNull(reader.textOf("missing"))
+    }
+
+    @Test
+    fun `textOf still resolves the text after the idea is promoted`() {
+        val store = fakeStore(
+            IdeaCapturedEvent("i1", session, "prefer data classes", timestampMs = 1),
+            IdeaPromotedEvent("i1", session, "prefer data classes", timestampMs = 5),
+        )
+        val reader = IdeaReader(store)
+
+        // The capture stays in the log (invariant #1), so the text remains readable.
+        assertEquals("prefer data classes", reader.textOf("i1"))
+        assertTrue(reader.activeIdeas().isEmpty())
+    }
+
+    private fun fakeStore(vararg payloads: EventPayload): EventStore = FakeEventStore(payloads.toList())
+
+    /** Minimal read-only [EventStore]: only [allEvents] is exercised by [IdeaReader]. */
+    private class FakeEventStore(payloads: List<EventPayload>) : EventStore {
+        private val stored: List<StoredEvent> = payloads.mapIndexed { index, payload ->
+            StoredEvent(
+                metadata = EventMetadata(
+                    eventId = EventId("e-$index"),
+                    sessionId = SessionId("s-1"),
+                    timestamp = Instant.fromEpochMilliseconds(index.toLong()),
+                    schemaVersion = 1,
+                    causationId = null,
+                    correlationId = null,
+                ),
+                sequence = index.toLong(),
+                sessionSequence = index.toLong(),
+                payload = payload,
+            )
+        }
+
+        override fun allEvents(): Sequence<StoredEvent> = stored.asSequence()
+
+        override suspend fun append(event: NewEvent): StoredEvent = throw NotImplementedError()
+        override suspend fun appendAll(events: List<NewEvent>): List<StoredEvent> = throw NotImplementedError()
+        override fun read(sessionId: SessionId): List<StoredEvent> = throw NotImplementedError()
+        override fun readFrom(sessionId: SessionId, fromSequence: Long): List<StoredEvent> =
+            throw NotImplementedError()
+        override fun lastSequence(sessionId: SessionId): Long? = throw NotImplementedError()
+        override fun subscribe(sessionId: SessionId): Flow<StoredEvent> = emptyFlow()
+        override fun subscribeAll(): Flow<StoredEvent> = emptyFlow()
+        override suspend fun lastGlobalSequence(): Long = throw NotImplementedError()
+        override fun allSessionIds(): Set<SessionId> = throw NotImplementedError()
+    }
+}