generator client {
  provider = "prisma-client-js"
}

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

// ── Users ──

model User {
  id           String   @id @default(cuid())
  email        String   @unique
  name         String?
  passwordHash String
  role         Role     @default(USER)
  provider     String?
  externalId   String?
  version      Int      @default(1)
  createdAt    DateTime @default(now())
  updatedAt    DateTime @updatedAt

  sessions         Session[]
  auditLogs        AuditLog[]
  ownedProjects    Project[]
  groupMemberships GroupMember[]
  mcpTokens        McpToken[]
  ownedAgents      Agent[]
  chatThreads      ChatThread[]

  @@index([email])
}

enum Role {
  USER
  ADMIN
}

// ── Sessions ──

model Session {
  id        String   @id @default(cuid())
  token     String   @unique
  userId    String
  expiresAt DateTime
  createdAt DateTime @default(now())

  user User @relation(fields: [userId], references: [id], onDelete: Cascade)

  @@index([token])
  @@index([userId])
  @@index([expiresAt])
}

// ── MCP Servers ──

model McpServer {
  id            String    @id @default(cuid())
  name          String    @unique
  description   String    @default("")
  packageName   String?
  runtime       String?
  dockerImage   String?
  transport     Transport @default(STDIO)
  repositoryUrl String?
  externalUrl   String?
  command       Json?
  containerPort Int?
  replicas      Int       @default(1)
  env           Json      @default("[]")
  healthCheck   Json?
  version       Int       @default(1)
  createdAt     DateTime  @default(now())
  updatedAt     DateTime  @updatedAt

  templateName    String?
  templateVersion String?

  instances McpInstance[]
  projects  ProjectServer[]

  @@index([name])
}

enum Transport {
  STDIO
  SSE
  STREAMABLE_HTTP
}

// ── MCP Templates ──

model McpTemplate {
  id            String    @id @default(cuid())
  name          String    @unique
  version       String    @default("1.0.0")
  description   String    @default("")
  packageName   String?
  runtime       String?
  dockerImage   String?
  transport     Transport @default(STDIO)
  repositoryUrl String?
  externalUrl   String?
  command       Json?
  containerPort Int?
  replicas      Int       @default(1)
  env           Json      @default("[]")
  healthCheck   Json?
  createdAt     DateTime  @default(now())
  updatedAt     DateTime  @updatedAt

  @@index([name])
}

// ── Secret Backends ──
//
// Pluggable storage for Secret.data. Default is `plaintext` (data stored in
// Secret.data JSON). Other drivers (e.g. `openbao`) store only a reference in
// Secret.externalRef and fetch actual values from the external system at read
// time. A `plaintext` row is seeded on first startup so the system always has
// a viable backend; additional backends are user-managed via
// `mcpctl create secretbackend`.

model SecretBackend {
  id          String   @id @default(cuid())
  name        String   @unique
  type        String // plaintext | openbao | (future: vault, aws-sm, ...)
  config      Json     @default("{}") // type-specific: url, mount, namespace, tokenSecretRef
  // Runtime metadata for auto-rotating backend credentials (openbao token
  // auth). Fields: generatedAt, nextRenewalAt, validUntil, lastRotationAt,
  // lastRotationError, rotatable (true only for wizard-provisioned tokens).
  // Empty object for backends that don't use rotation (plaintext, kubernetes
  // auth, or static tokens). Managed entirely by the rotator service.
  tokenMeta   Json     @default("{}")
  isDefault   Boolean  @default(false) // exactly one row has isDefault=true
  description String   @default("")
  version     Int      @default(1)
  createdAt   DateTime @default(now())
  updatedAt   DateTime @updatedAt

  secrets Secret[]

  @@index([name])
  @@index([isDefault])
}

// ── Secrets ──

model Secret {
  id          String   @id @default(cuid())
  name        String   @unique
  // FK to SecretBackend. Default empty string lets `prisma db push` add the
  // column to pre-existing rows without a data-loss reset; `bootstrapSecretBackends`
  // then points any empty-string values at the seeded `default` plaintext backend
  // on next mcpd startup. New rows written by SecretService always carry a
  // valid FK immediately.
  backendId   String   @default("")
  data        Json     @default("{}") // populated by plaintext backend only
  externalRef String   @default("") // populated by non-plaintext backends (e.g. "mount/path#v3")
  // Sorted list of the secret's data keys WITHOUT their values. Populated on
  // every create/update/migrate so list views and describe-without-reveal can
  // show "this secret has GRAFANA_URL + GRAFANA_TOKEN" without fetching the
  // backing data. For pre-existing rows the field is empty until the next
  // write or a lazy resolve in getById fills it in.
  keyNames    Json     @default("[]")
  version     Int      @default(1)
  createdAt   DateTime @default(now())
  updatedAt   DateTime @updatedAt

  backend SecretBackend @relation(fields: [backendId], references: [id])
  llms    Llm[]

  @@index([name])
  @@index([backendId])
}

// ── LLMs ──
//
// Server-managed LLM providers. Clients (agent, HTTP-mode mcplocal) send
// OpenAI-format requests to `mcpd /api/v1/llms/:name/infer` — mcpd attaches the
// provider API key server-side so credentials never leave the cluster.
// Credentials are stored by reference: `apiKeySecret` points at a Secret, and
// `apiKeySecretKey` names the key within that secret's data.
//
// `kind=virtual` rows are *registered by an mcplocal client* (rather than a
// human via `mcpctl create llm`). Their inference is relayed back through
// the SSE control channel to the publishing mcplocal session. The lifecycle
// fields (lastHeartbeatAt, status, inactiveSince) belong to virtual rows;
// public rows ignore them.

enum LlmKind {
  public // upstream-URL row, mcpd calls directly
  virtual // mcplocal-registered, inference relayed via SSE control channel
}

enum LlmStatus {
  active // healthy, accepting requests
  inactive // publisher went away; row pending 4-h GC
  hibernating // publisher present but backend asleep — wakes on demand (v2)
}

model Llm {
  id                String    @id @default(cuid())
  name              String    @unique
  type              String // anthropic | openai | deepseek | vllm | ollama | gemini-cli
  model             String // e.g. claude-3-5-sonnet-20241022
  url               String    @default("") // endpoint (empty for provider default)
  tier              String    @default("fast") // fast | heavy
  description       String    @default("")
  apiKeySecretId    String? // FK to Secret
  apiKeySecretKey   String? // key inside the Secret's data
  extraConfig       Json      @default("{}") // per-type extras
  // ── LB pool by name (v4) ──
  // When set, this Llm is part of a load-balanced pool. Multiple Llms
  // sharing the same `poolName` stack into a pool that the chat dispatcher
  // expands at request time and picks an active member from. When NULL,
  // the effective pool key is the row's own `name` (i.e. "pool of 1",
  // identical to pre-v4 behavior). Agents pin to a single Llm by id; the
  // dispatcher transparently widens to the pool when this field is set.
  poolName          String?
  // ── Virtual-provider lifecycle (NULL/default for kind=public) ──
  kind              LlmKind   @default(public)
  providerSessionId String? // mcplocal session that owns this row when virtual
  lastHeartbeatAt   DateTime? // bumped on every publisher heartbeat
  status            LlmStatus @default(active)
  inactiveSince     DateTime? // when status flipped from active; used for 4-h GC
  // ── Per-user RBAC scoping (v7) ──
  // `ownerId` records who created/published the row. NULL on legacy rows
  // (those created before the v7 migration) — those continue to behave
  // as `visibility=public` for back-compat. New rows always carry an
  // ownerId set by the service layer (`User.id` of the authenticated
  // caller, or the publishing mcplocal user for virtuals).
  //
  // `visibility` controls who can see / use the row:
  //   - 'public'  : anyone with the resource grant (`view:llms`,
  //                 `run:llms:<name>`, etc.) sees it. Legacy default
  //                 mirrors today's behavior — explicit
  //                 `mcpctl create llm` calls keep this default.
  //   - 'private' : only the owner sees it by default; other users need
  //                 an explicit name-scoped RBAC binding
  //                 (`view:llms:<name>`, `run:llms:<name>`). The list
  //                 endpoint hides foreign-private rows from
  //                 unauthorized callers; get/describe returns 404 to
  //                 prevent name enumeration.
  //
  // mcplocal-published virtual Llms default to 'private' on register —
  // a workstation-published model isn't typically meant for the whole
  // org until the publisher explicitly shares it. See docs/virtual-llms.md.
  ownerId           String?
  visibility        String    @default("public")
  version           Int       @default(1)
  createdAt         DateTime  @default(now())
  updatedAt         DateTime  @updatedAt

  apiKeySecret Secret? @relation(fields: [apiKeySecretId], references: [id], onDelete: SetNull)
  agents       Agent[]

  @@index([name])
  @@index([tier])
  @@index([apiKeySecretId])
  @@index([kind, status])
  @@index([providerSessionId])
  @@index([poolName])
  // List filter on the hot path: "rows visible to caller X" decomposes
  // into `visibility='public' OR ownerId=X` + an RBAC join. Composite
  // index keeps the predicate fast even on a large table.
  @@index([visibility, ownerId])
}

// ── Groups ──

model Group {
  id          String   @id @default(cuid())
  name        String   @unique
  description String   @default("")
  version     Int      @default(1)
  createdAt   DateTime @default(now())
  updatedAt   DateTime @updatedAt

  members GroupMember[]

  @@index([name])
}

model GroupMember {
  id        String   @id @default(cuid())
  groupId   String
  userId    String
  createdAt DateTime @default(now())

  group Group @relation(fields: [groupId], references: [id], onDelete: Cascade)
  user  User  @relation(fields: [userId], references: [id], onDelete: Cascade)

  @@unique([groupId, userId])
  @@index([groupId])
  @@index([userId])
}

// ── RBAC Definitions ──

model RbacDefinition {
  id           String   @id @default(cuid())
  name         String   @unique
  subjects     Json     @default("[]")
  roleBindings Json     @default("[]")
  version      Int      @default(1)
  createdAt    DateTime @default(now())
  updatedAt    DateTime @updatedAt

  @@index([name])
}

// ── Projects ──

model Project {
  id              String   @id @default(cuid())
  name            String   @unique
  description     String   @default("")
  prompt          String   @default("")
  proxyModel      String   @default("")
  gated           Boolean  @default(true)
  llmProvider     String?
  llmModel        String?
  serverOverrides Json?
  ownerId         String
  version         Int      @default(1)
  createdAt       DateTime @default(now())
  updatedAt       DateTime @updatedAt

  owner          User               @relation(fields: [ownerId], references: [id], onDelete: Cascade)
  servers        ProjectServer[]
  prompts        Prompt[]
  promptRequests PromptRequest[]
  proposals      ResourceProposal[]
  skills         Skill[]
  mcpTokens      McpToken[]
  agents         Agent[]
  chatThreads    ChatThread[]

  @@index([name])
  @@index([ownerId])
}

model ProjectServer {
  id        String   @id @default(cuid())
  projectId String
  serverId  String
  createdAt DateTime @default(now())

  project Project   @relation(fields: [projectId], references: [id], onDelete: Cascade)
  server  McpServer @relation(fields: [serverId], references: [id], onDelete: Cascade)

  @@unique([projectId, serverId])
}

// ── MCP Tokens (bearer credentials for HTTP-mode mcplocal) ──
//
// Raw value format: `mcpctl_pat_<32 base62 chars>`. The raw value is shown
// exactly once at create time; only the SHA-256 hash is persisted. Tokens are
// scoped to exactly one project — they're only valid at
// `/projects/<that-project>/mcp`. Creator's RBAC is the ceiling; the service
// rejects bindings that exceed what the creator themselves can do.

model McpToken {
  id          String    @id @default(cuid())
  name        String
  projectId   String
  tokenHash   String    @unique
  tokenPrefix String
  ownerId     String
  description String    @default("")
  createdAt   DateTime  @default(now())
  expiresAt   DateTime?
  lastUsedAt  DateTime?
  revokedAt   DateTime?

  project Project @relation(fields: [projectId], references: [id], onDelete: Cascade)
  owner   User    @relation(fields: [ownerId], references: [id], onDelete: Cascade)

  @@unique([name, projectId])
  @@index([tokenHash])
  @@index([projectId])
  @@index([ownerId])
}

// ── MCP Instances (running containers) ──

model McpInstance {
  id              String         @id @default(cuid())
  serverId        String
  containerId     String?
  status          InstanceStatus @default(STOPPED)
  port            Int?
  metadata        Json           @default("{}")
  healthStatus    String?
  lastHealthCheck DateTime?
  events          Json           @default("[]")
  version         Int            @default(1)
  createdAt       DateTime       @default(now())
  updatedAt       DateTime       @updatedAt

  server McpServer @relation(fields: [serverId], references: [id], onDelete: Cascade)

  @@index([serverId])
  @@index([status])
}

enum InstanceStatus {
  STARTING
  RUNNING
  STOPPING
  STOPPED
  ERROR
}

// ── Prompts (approved content resources) ──

model Prompt {
  id                String   @id @default(cuid())
  name              String
  content           String   @db.Text
  projectId         String?
  agentId           String?
  priority          Int      @default(5)
  summary           String?  @db.Text
  chapters          Json?
  linkTarget        String?
  // Semantic version of the current content. Auto-bumped patch on every save
  // by PromptService.update; author can pass --bump major|minor|patch or
  // --semver X.Y.Z to override. NOT the same as `version` below — that one
  // is the optimistic-concurrency counter and stays Int.
  semver            String   @default("0.1.0")
  // Soft pointer to the latest ResourceRevision row for this prompt. NULL
  // before the first revision is recorded. Set in the same transaction as
  // create/update by PromptService.
  currentRevisionId String?
  version           Int      @default(1)
  createdAt         DateTime @default(now())
  updatedAt         DateTime @updatedAt

  project       Project?            @relation(fields: [projectId], references: [id], onDelete: Cascade)
  agent         Agent?              @relation(fields: [agentId], references: [id], onDelete: Cascade)
  personalities PersonalityPrompt[]

  @@unique([name, projectId])
  @@unique([name, agentId])
  @@index([projectId])
  @@index([agentId])
}

// ── Skills (Claude Code skill bundles, synced to ~/.claude/skills/<name>/) ──
//
// Skills are the on-disk counterpart to Prompts. mcpd is the source of truth;
// mcpctl skills sync materialises them onto disk under
// ~/.claude/skills/<name>/SKILL.md (+ optional aux files) where Claude Code
// reads them natively. Same scoping rules as Prompt (project XOR agent XOR
// neither = global). Multi-file bundles live in `files` (path → content).
// Typed skill metadata (hooks, mcpServers, postInstall, …) is validated in
// the app layer and stored opaquely here in `metadata`.

model Skill {
  id                String   @id @default(cuid())
  name              String
  description       String   @default("")
  // Body of the SKILL.md file delivered to Claude Code.
  content           String   @db.Text
  // Auxiliary files in the skill bundle. Map of relative path → file content
  // (UTF-8 text only in v1; binaries deferred). Materialised onto disk at sync
  // time alongside SKILL.md.
  files             Json     @default("{}")
  // Typed-but-stored-as-Json: { hooks?, mcpServers?, postInstall?,
  //   preUninstall?, postInstallTimeoutSec? }. Validated at the route layer
  //   (see src/mcpd/src/validation/skill.schema.ts in PR-3).
  metadata          Json     @default("{}")
  projectId         String?
  agentId           String?
  priority          Int      @default(5)
  summary           String?  @db.Text
  chapters          Json?
  // Semantic version of the current content. Auto-bumped patch on every save
  // by SkillService.update; author can override via --bump or --semver.
  semver            String   @default("0.1.0")
  // Soft pointer to the latest ResourceRevision row for this skill. NULL
  // before the first revision is recorded.
  currentRevisionId String?
  // Optimistic-concurrency counter. NOT semver — that's `semver` above.
  version           Int      @default(1)
  createdAt         DateTime @default(now())
  updatedAt         DateTime @updatedAt

  project Project? @relation(fields: [projectId], references: [id], onDelete: Cascade)
  agent   Agent?   @relation(fields: [agentId], references: [id], onDelete: Cascade)

  @@unique([name, projectId])
  @@unique([name, agentId])
  @@index([projectId])
  @@index([agentId])
  @@index([name])
}

// ── Prompt Requests (pending proposals from LLM sessions) ──

model PromptRequest {
  id               String   @id @default(cuid())
  name             String
  content          String   @db.Text
  projectId        String?
  priority         Int      @default(5)
  createdBySession String?
  createdByUserId  String?
  createdAt        DateTime @default(now())

  project Project? @relation(fields: [projectId], references: [id], onDelete: Cascade)

  @@unique([name, projectId])
  @@index([projectId])
  @@index([createdBySession])
}

// ── ResourceRevision (append-only audit + diff log) ──
//
// Both Prompt and Skill rows produce revisions on every change. Hot reads
// (gate plugin, mcpctl skills sync, prompt index for LLM selection) stay on
// the resource row's inline content; revisions are only consulted by
// history/diff/restore endpoints. Approving a ResourceProposal atomically
// inserts the resource + a revision in the same transaction.
//
// `resourceId` is a soft FK with NO referential constraint — revisions
// outlive the resources they describe so audit history isn't lost when
// a resource is deleted. Validated app-layer.

model ResourceRevision {
  id              String   @id @default(cuid())
  // Discriminator: 'prompt' | 'skill'. TEXT, not enum, to make adding a
  // third resource type later a non-migration change.
  resourceType    String
  resourceId      String
  semver          String   @default("0.1.0")
  // sha256 of the canonicalised body — stable diff key. Two revisions with
  // the same hash are byte-identical (skills sync uses this to skip work
  // even when semver hasn't bumped).
  contentHash     String
  // Snapshot of the resource at this revision: { content, metadata?, ... }
  body            Json
  authorUserId    String?
  authorSessionId String?
  note            String   @default("")
  createdAt       DateTime @default(now())

  // History viewer: latest-first within a resource.
  @@index([resourceType, resourceId, createdAt(sort: Desc)])
  // Direct lookup by semver.
  @@index([resourceType, resourceId, semver])
  // Sync diff cross-resource lookup ("do I already have a revision with
  // this contentHash anywhere?") — useful for detecting renames + dedup.
  @@index([contentHash])
  @@index([authorUserId])
}

// ── ResourceProposal (generic propose/approve/reject queue) ──
//
// A pending change to a Prompt or Skill, submitted by an LLM session via
// the propose_prompt / propose_skill MCP tools (see mcplocal gate plugin)
// or by a human via the web UI / CLI. Reviewers drain the queue via
// `mcpctl review next`. Approving creates the underlying resource (if new)
// and writes a ResourceRevision; the proposal status flips to 'approved'
// and `approvedRevisionId` points at the resulting revision row.
//
// Replaces the prompt-only PromptRequest table; the cutover happens in PR-2
// (rename + backfill + service rewire).

model ResourceProposal {
  id                 String   @id @default(cuid())
  resourceType       String // 'prompt' | 'skill'
  name               String
  // Proposed body — { content, metadata? } shaped per resourceType.
  body               Json
  projectId          String?
  agentId            String?
  createdBySession   String?
  createdByUserId    String?
  status             String   @default("pending") // pending | approved | rejected
  reviewerNote       String   @default("")
  // Set when status='approved': the ResourceRevision the approval created.
  approvedRevisionId String?
  // Optimistic-concurrency counter for concurrent reviewer actions.
  version            Int      @default(1)
  createdAt          DateTime @default(now())
  updatedAt          DateTime @updatedAt

  project Project? @relation(fields: [projectId], references: [id], onDelete: Cascade)
  agent   Agent?   @relation(fields: [agentId], references: [id], onDelete: Cascade)

  // Mirrors Prompt's two-unique pattern: a (type, name) pair can have one
  // proposal per project XOR one per agent. NULL semantics inherit Postgres
  // defaults (NULL distinct from NULL); the app layer reuses the `?? ''`
  // workaround for direct compound-key lookups, same as Prompt.
  @@unique([resourceType, name, projectId])
  @@unique([resourceType, name, agentId])
  @@index([resourceType, status])
  @@index([projectId])
  @@index([createdBySession])
}

// ── Audit Events (pipeline/gate/tool trace from mcplocal) ──

model AuditEvent {
  id            String   @id @default(cuid())
  timestamp     DateTime
  sessionId     String
  projectName   String
  eventKind     String
  source        String
  verified      Boolean  @default(false)
  serverName    String?
  correlationId String?
  parentEventId String?
  userName      String?
  tokenName     String?
  tokenSha      String?
  payload       Json
  createdAt     DateTime @default(now())

  @@index([sessionId])
  @@index([projectName])
  @@index([correlationId])
  @@index([timestamp])
  @@index([eventKind])
  @@index([userName])
  @@index([tokenSha])
}

// ── Backup Pending Queue ──

model BackupPending {
  id           String   @id @default(cuid())
  resourceKind String
  resourceName String
  action       String // 'create' | 'update' | 'delete'
  userName     String
  yamlContent  String?  @db.Text
  createdAt    DateTime @default(now())

  @@index([createdAt])
}

// ── Agents (LLM personas pinned to a specific Llm) ──
//
// Agents combine a system prompt, a pinned LLM, and (optionally) a project to
// inherit Prompts from. Each Agent is also exposed by mcplocal as a virtual
// MCP server (`agent-<name>/chat`), so other clients can consult it as a tool.
// Per-call LiteLLM-style overrides stack on top of `defaultParams`.

model Agent {
  id                   String    @id @default(cuid())
  name                 String    @unique
  description          String    @default("") // shown in MCP tools/list
  systemPrompt         String    @default("") @db.Text // agent persona
  llmId                String
  projectId            String?
  defaultPersonalityId String? // applied at chat time when no --personality flag
  proxyModelName       String? // optional informational override
  defaultParams        Json      @default("{}") // LiteLLM-style: temperature, top_p, top_k, max_tokens, stop, ...
  extras               Json      @default("{}") // future LoRA / tool-allowlist
  // ── Virtual-agent lifecycle (NULL/default for kind=public, mirrors Llm) ──
  kind                 LlmKind   @default(public)
  providerSessionId    String? // mcplocal session that owns this row when virtual
  lastHeartbeatAt      DateTime?
  status               LlmStatus @default(active)
  inactiveSince        DateTime?
  ownerId              String
  // v7: per-user RBAC scoping. Mirrors `Llm.visibility` semantics —
  // 'public' (default, today's behavior) lets anyone with the resource
  // grant see the agent; 'private' restricts to owner + explicit
  // name-scoped RBAC bindings. mcplocal-published virtual agents
  // default to 'private' on register so a workstation-published persona
  // isn't broadcast to the whole org until shared explicitly. Existing
  // rows backfill to 'public' so pre-v7 setups keep working unchanged.
  visibility           String    @default("public")
  version              Int       @default(1)
  createdAt            DateTime  @default(now())
  updatedAt            DateTime  @updatedAt

  llm                Llm                @relation(fields: [llmId], references: [id], onDelete: Restrict)
  project            Project?           @relation(fields: [projectId], references: [id], onDelete: SetNull)
  owner              User               @relation(fields: [ownerId], references: [id], onDelete: Cascade)
  threads            ChatThread[]
  prompts            Prompt[]
  proposals          ResourceProposal[]
  skills             Skill[]
  personalities      Personality[]      @relation("AgentPersonalities")
  defaultPersonality Personality?       @relation("AgentDefaultPersonality", fields: [defaultPersonalityId], references: [id], onDelete: SetNull)

  @@index([name])
  @@index([llmId])
  @@index([projectId])
  @@index([ownerId])
  @@index([defaultPersonalityId])
  @@index([kind, status])
  @@index([providerSessionId])
  @@index([visibility, ownerId])
}

// ── Personalities (named overlay bundles of prompts on top of an Agent) ──
//
// VLAN-on-ethernet semantics: an Agent works without a Personality (today's
// flow). Selecting a Personality adds its bound Prompts to the system block
// after the Agent's own systemPrompt, agent-direct prompts, and project
// prompts — additive, never replacing.

model Personality {
  id          String   @id @default(cuid())
  name        String
  description String   @default("")
  agentId     String
  priority    Int      @default(5)
  createdAt   DateTime @default(now())
  updatedAt   DateTime @updatedAt

  agent           Agent               @relation("AgentPersonalities", fields: [agentId], references: [id], onDelete: Cascade)
  prompts         PersonalityPrompt[]
  defaultForAgent Agent[]             @relation("AgentDefaultPersonality")

  @@unique([name, agentId])
  @@index([agentId])
}

// ── Personality ↔ Prompt join table ──
//
// A Prompt can be bound to many Personalities; a Personality can bind many
// Prompts. The `priority` here overrides the Prompt's own priority *within
// this Personality's overlay slice* (so the same prompt can be high-priority
// in one personality and low in another).

model PersonalityPrompt {
  id            String   @id @default(cuid())
  personalityId String
  promptId      String
  priority      Int      @default(5)
  createdAt     DateTime @default(now())

  personality Personality @relation(fields: [personalityId], references: [id], onDelete: Cascade)
  prompt      Prompt      @relation(fields: [promptId], references: [id], onDelete: Cascade)

  @@unique([personalityId, promptId])
  @@index([personalityId])
  @@index([promptId])
}

// ── Chat Threads (persisted conversation per Agent) ──

model ChatThread {
  id         String   @id @default(cuid())
  // A thread is scoped to an Agent XOR a Project (enforced by a CHECK
  // constraint in the migration + the service layer). Project-scoped threads
  // back `mcpctl chat --project <name>`.
  agentId    String?
  projectId  String?
  ownerId    String
  title      String   @default("")
  lastTurnAt DateTime @default(now())
  createdAt  DateTime @default(now())
  updatedAt  DateTime @updatedAt

  agent    Agent?        @relation(fields: [agentId], references: [id], onDelete: Cascade)
  project  Project?      @relation(fields: [projectId], references: [id], onDelete: Cascade)
  owner    User          @relation(fields: [ownerId], references: [id], onDelete: Cascade)
  messages ChatMessage[]

  @@index([agentId, lastTurnAt(sort: Desc)])
  @@index([projectId, lastTurnAt(sort: Desc)])
  @@index([ownerId])
}

// ── Chat Messages ──
//
// `turnIndex` is monotonic per thread; the @@unique enforces ordering even
// under racing appends (callers retry on collision). `status` stays `pending`
// until the orchestrator confirms the turn completed successfully.

model ChatMessage {
  id         String   @id @default(cuid())
  threadId   String
  turnIndex  Int
  role       String // 'system' | 'user' | 'assistant' | 'tool'
  content    String   @db.Text
  toolCalls  Json? // assistant turn: [{id,name,arguments}]
  toolCallId String? // tool turn: which call this answers
  status     String   @default("complete") // 'pending' | 'complete' | 'error'
  createdAt  DateTime @default(now())

  thread ChatThread @relation(fields: [threadId], references: [id], onDelete: Cascade)

  @@unique([threadId, turnIndex])
  @@index([threadId, createdAt])
}

// ── Inference Tasks (v5) ──
//
// Every inference call (sync infer, agent chat, async POST /inference-tasks)
// creates a row here. The DB is the source of truth; mcpd's previous
// in-memory `pendingTasks` map is gone — the result-handler updates the row
// and an in-process EventEmitter wakes any blocked HTTP handlers (single-
// instance for now; multi-instance scaling is a v6 concern that will swap
// the emitter for pg LISTEN/NOTIFY without changing the data model).
//
// Routing: `poolName` is the effective pool key at enqueue time
// (`Llm.poolName ?? Llm.name`). Workers (mcplocal sessions) drain pending
// rows whose `poolName` matches the pool keys they own when they bind their
// SSE channel — that's how queued tasks survive worker offline windows.

enum InferenceTaskStatus {
  pending // in queue, no worker has it yet (or claim was reverted)
  claimed // a worker has it (SSE frame sent), no chunks back yet
  running // worker started streaming chunks back (streaming tasks only)
  completed // worker POSTed the final result
  error // permanent failure (auth, bad request, queue timeout)
  cancelled // caller said never mind via DELETE
}

model InferenceTask {
  id              String              @id @default(cuid())
  status          InferenceTaskStatus @default(pending)
  // Routing — pool key drives worker matching at claim time. Stored at
  // enqueue time so a later rename of Llm.poolName doesn't reroute
  // already-queued work.
  poolName        String
  llmName         String // pinned target Llm name (for audit + agent backref)
  model           String
  tier            String?
  // Worker tracking. NULL while pending; set on claim; cleared on
  // unbindSession-driven revert (worker disconnect mid-task).
  claimedBy       String?
  // Body + result. Both are Json so streaming chunks can be reconstructed
  // (see TaskService.complete) and async pollers get a structured payload.
  // requestBody is required (the OpenAI chat-completion request body the
  // worker should run); responseBody is null until status=completed.
  requestBody     Json
  responseBody    Json?
  errorMessage    String?
  /**
   * Whether the original request asked for streaming. Drives the chunk-vs-
   * final-body protocol on the result POST and tells async API callers
   * whether `/stream` will yield chunks or just a single completion event.
   */
  streaming       Boolean             @default(false)
  // Timestamps for observability + GC:
  //   pending → claimed: claimedAt set
  //   claimed → running: streamStartedAt set (first chunk received)
  //   running/claimed → completed/error/cancelled: completedAt set
  createdAt       DateTime            @default(now())
  claimedAt       DateTime?
  streamStartedAt DateTime?
  completedAt     DateTime?
  // Caller tracking — RBAC + observability. ownerId references User.id;
  // agentId is set when the task came in via /agents/<name>/chat (null
  // for direct /llms/<name>/infer or async POST /inference-tasks calls
  // that don't pin an agent).
  ownerId         String
  agentId         String?

  @@index([status, poolName])
  @@index([claimedBy])
  @@index([ownerId])
  @@index([agentId])
  // GC sweep predicate: completedAt < 7d ago. Index speeds up the daily
  // cleanup without scanning the whole table.
  @@index([completedAt])
}

// ── Audit Logs ──

model AuditLog {
  id         String   @id @default(cuid())
  userId     String
  action     String
  resource   String
  resourceId String?
  details    Json     @default("{}")
  createdAt  DateTime @default(now())

  user User @relation(fields: [userId], references: [id], onDelete: Cascade)

  @@index([userId])
  @@index([action])
  @@index([resource])
  @@index([createdAt])
}