Table chat_histories {
  id bigserial [pk]
  guid uuid [unique, not null, default: `gen_random_uuid()`]
  session_id text [not null]
  title text
  channel text
  agent_id text
  project_id bigint [ref: > projects.id]
  messages jsonb [not null, default: `'[]'`]
  summary text
  metadata jsonb [not null, default: `'{}'`]
  created_at timestamptz [not null, default: `now()`]
  updated_at timestamptz [not null, default: `now()`]

  indexes {
    session_id
    project_id
    channel
    agent_id
    created_at
  }
}

Table tool_annotations {
  id bigserial [pk]
  tool_name text [unique, not null]
  notes text [not null, default: '']
  created_at timestamptz [not null, default: `now()`]
  updated_at timestamptz [not null, default: `now()`]
}

// Cross-file refs (for relspecgo merge)
Ref: chat_histories.project_id > projects.id [delete: set null]

Table learnings {
  id bigserial [pk]
  guid uuid [unique, not null, default: `gen_random_uuid()`]
  summary text [not null]
  details text [not null, default: '']
  category text [not null, default: 'insight']
  area text [not null, default: 'other']
  status text [not null, default: 'pending']
  priority text [not null, default: 'medium']
  confidence text [not null, default: 'hypothesis']
  action_required boolean [not null, default: false]
  source_type text
  source_ref text
  project_id bigint [ref: > projects.id]
  related_thought_id bigint [ref: > thoughts.id]
  related_skill_id bigint [ref: > agent_skills.id]
  reviewed_by text
  reviewed_at timestamptz
  duplicate_of_learning_id bigint [ref: > learnings.id]
  supersedes_learning_id bigint [ref: > learnings.id]
  tags "text[]" [not null, default: `'{}'`]
  created_at timestamptz [not null, default: `now()`]
  updated_at timestamptz [not null, default: `now()`]

  indexes {
    project_id
    category
    area
    status
    priority
    reviewed_at
    tags [type: gin]
    summary [type: gin]
    details [type: gin]
  }
}

// Cross-file refs (for relspecgo merge)
Ref: learnings.project_id > projects.id [delete: set null]
Ref: learnings.related_thought_id > thoughts.id [delete: set null]
Ref: learnings.related_skill_id > agent_skills.id [delete: set null]
Ref: learnings.duplicate_of_learning_id > learnings.id [delete: set null]
Ref: learnings.supersedes_learning_id > learnings.id [delete: set null]