diff --git a/schemas/10-documents-schema-ddl.sql b/schemas/10-documents-schema-ddl.sql
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+-- ============================================================================
+-- 10-documents-schema-ddl.sql
+-- Schema: documents
+-- ERP Construccion - Modulo Gestion Documental (MAE-016)
+-- ============================================================================
+-- Descripcion: Sistema de gestion documental incluyendo:
+--   - Repositorio de documentos estructurado
+--   - Control de versiones
+--   - Flujos de aprobacion
+--   - Permisos granulares
+--   - Anotaciones sobre planos
+--   - Integracion con almacenamiento externo (S3)
+-- ============================================================================
+-- Autor: Claude-Arquitecto-Orquestador
+-- Fecha: 2026-01-25
+-- Version: 1.0.0
+-- ============================================================================
+
+-- Crear schema si no existe
+CREATE SCHEMA IF NOT EXISTS documents;
+
+-- ============================================================================
+-- ENUMS
+-- ============================================================================
+
+-- Tipo de documento
+CREATE TYPE documents.document_type AS ENUM (
+    'plan',           -- Planos arquitectonicos/estructurales
+    'specification',  -- Especificaciones tecnicas
+    'contract',       -- Contratos
+    'permit',         -- Permisos y licencias
+    'report',         -- Reportes
+    'photograph',     -- Fotografias
+    'drawing',        -- Dibujos y croquis
+    'manual',         -- Manuales
+    'procedure',      -- Procedimientos
+    'form',           -- Formatos
+    'correspondence', -- Correspondencia
+    'invoice',        -- Facturas
+    'estimate',       -- Estimaciones/Presupuestos
+    'other'           -- Otro
+);
+
+-- Estado del documento
+CREATE TYPE documents.document_status AS ENUM (
+    'draft',          -- Borrador
+    'pending_review', -- Pendiente de revision
+    'in_review',      -- En revision
+    'approved',       -- Aprobado
+    'rejected',       -- Rechazado
+    'obsolete',       -- Obsoleto
+    'archived'        -- Archivado
+);
+
+-- Nivel de acceso
+CREATE TYPE documents.access_level AS ENUM (
+    'public',       -- Publico (todos en el tenant)
+    'internal',     -- Interno (empleados)
+    'confidential', -- Confidencial
+    'restricted'    -- Restringido (solo autorizados)
+);
+
+-- Estado de version
+CREATE TYPE documents.version_status AS ENUM (
+    'current',    -- Version actual
+    'superseded', -- Reemplazada
+    'archived'    -- Archivada
+);
+
+-- Estado de flujo de aprobacion
+CREATE TYPE documents.workflow_status AS ENUM (
+    'draft',       -- Borrador
+    'pending',     -- Pendiente
+    'in_progress', -- En progreso
+    'approved',    -- Aprobado
+    'rejected',    -- Rechazado
+    'cancelled'    -- Cancelado
+);
+
+-- Tipo de paso de aprobacion
+CREATE TYPE documents.approval_step_type AS ENUM (
+    'review',    -- Revision
+    'approval',  -- Aprobacion
+    'signature', -- Firma
+    'comment'    -- Solo comentario
+);
+
+-- Accion de aprobacion
+CREATE TYPE documents.approval_action AS ENUM (
+    'approve',        -- Aprobar
+    'reject',         -- Rechazar
+    'request_changes' -- Solicitar cambios
+);
+
+-- Tipo de anotacion
+CREATE TYPE documents.annotation_type AS ENUM (
+    'comment',   -- Comentario
+    'markup',    -- Marcado
+    'highlight', -- Resaltado
+    'arrow',     -- Flecha
+    'dimension', -- Dimension
+    'stamp',     -- Sello
+    'signature'  -- Firma
+);
+
+-- ============================================================================
+-- TABLAS
+-- ============================================================================
+
+-- ----------------------------------------------------------------------------
+-- 1. Categorias de Documentos
+-- ----------------------------------------------------------------------------
+CREATE TABLE documents.document_categories (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    tenant_id UUID NOT NULL,
+
+    -- Informacion basica
+    code VARCHAR(50) NOT NULL,
+    name VARCHAR(100) NOT NULL,
+    description TEXT,
+
+    -- Jerarquia
+    parent_id UUID REFERENCES documents.document_categories(id),
+    level INTEGER NOT NULL DEFAULT 1,
+    path VARCHAR(500), -- Path completo separado por /
+
+    -- Configuracion
+    default_access_level documents.access_level DEFAULT 'internal',
+    requires_approval BOOLEAN DEFAULT FALSE,
+    retention_days INTEGER, -- Tiempo de retencion en dias
+    allowed_extensions VARCHAR(255)[], -- Extensiones permitidas
+
+    -- Icono y color
+    icon VARCHAR(50),
+    color VARCHAR(20),
+
+    -- Estado
+    is_active BOOLEAN NOT NULL DEFAULT TRUE,
+    sort_order INTEGER DEFAULT 0,
+
+    -- Metadatos
+    metadata JSONB,
+
+    -- Auditoria
+    created_by UUID,
+    updated_by UUID,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    deleted_at TIMESTAMPTZ,
+
+    CONSTRAINT uq_document_categories_tenant_code UNIQUE (tenant_id, code)
+);
+
+-- ----------------------------------------------------------------------------
+-- 2. Documentos (Registro Principal)
+-- ----------------------------------------------------------------------------
+CREATE TABLE documents.documents (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    tenant_id UUID NOT NULL,
+
+    -- Identificacion
+    document_code VARCHAR(100) NOT NULL,
+    title VARCHAR(500) NOT NULL,
+    description TEXT,
+
+    -- Clasificacion
+    category_id UUID REFERENCES documents.document_categories(id),
+    document_type documents.document_type NOT NULL,
+    status documents.document_status NOT NULL DEFAULT 'draft',
+    access_level documents.access_level NOT NULL DEFAULT 'internal',
+
+    -- Version actual
+    current_version_id UUID, -- Se actualiza con trigger
+    current_version_number VARCHAR(20) DEFAULT '1.0',
+
+    -- Proyecto/Contexto
+    project_id UUID,
+    project_code VARCHAR(50),
+    project_name VARCHAR(255),
+
+    -- Metadatos del documento
+    author VARCHAR(255),
+    keywords VARCHAR(255)[],
+    tags VARCHAR(100)[],
+
+    -- Fechas importantes
+    document_date DATE,
+    effective_date DATE,
+    expiry_date DATE,
+    review_date DATE,
+
+    -- Origen
+    source VARCHAR(100), -- internal, external, contractor
+    external_reference VARCHAR(255), -- Referencia externa si aplica
+    original_filename VARCHAR(500),
+
+    -- Relaciones
+    parent_document_id UUID REFERENCES documents.documents(id), -- Documento padre
+    related_documents UUID[], -- Array de IDs relacionados
+
+    -- Flujo de aprobacion
+    requires_approval BOOLEAN DEFAULT FALSE,
+    current_workflow_id UUID,
+    approved_by_id UUID,
+    approved_at TIMESTAMPTZ,
+
+    -- Estadisticas
+    view_count INTEGER DEFAULT 0,
+    download_count INTEGER DEFAULT 0,
+    last_accessed_at TIMESTAMPTZ,
+
+    -- Flags
+    is_template BOOLEAN DEFAULT FALSE,
+    is_locked BOOLEAN DEFAULT FALSE,
+    locked_by_id UUID,
+    locked_at TIMESTAMPTZ,
+
+    -- Notas y metadatos
+    notes TEXT,
+    custom_fields JSONB,
+    metadata JSONB,
+
+    -- Auditoria
+    created_by UUID,
+    updated_by UUID,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    deleted_at TIMESTAMPTZ,
+
+    CONSTRAINT uq_documents_tenant_code UNIQUE (tenant_id, document_code)
+);
+
+-- ----------------------------------------------------------------------------
+-- 3. Versiones de Documentos
+-- ----------------------------------------------------------------------------
+CREATE TABLE documents.document_versions (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    tenant_id UUID NOT NULL,
+
+    -- Documento padre
+    document_id UUID NOT NULL REFERENCES documents.documents(id) ON DELETE CASCADE,
+
+    -- Version
+    version_number VARCHAR(20) NOT NULL,
+    version_label VARCHAR(100), -- Etiqueta opcional (ej: "Final", "Para construccion")
+    status documents.version_status NOT NULL DEFAULT 'current',
+
+    -- Archivo
+    file_name VARCHAR(500) NOT NULL,
+    file_extension VARCHAR(20) NOT NULL,
+    file_size_bytes BIGINT NOT NULL,
+    mime_type VARCHAR(100),
+    checksum_md5 VARCHAR(32),
+    checksum_sha256 VARCHAR(64),
+
+    -- Almacenamiento
+    storage_provider VARCHAR(50) NOT NULL DEFAULT 's3', -- s3, azure, local
+    storage_bucket VARCHAR(255),
+    storage_key VARCHAR(1000) NOT NULL, -- Path en el storage
+    storage_url VARCHAR(2000), -- URL de acceso
+    thumbnail_url VARCHAR(2000),
+    preview_url VARCHAR(2000),
+
+    -- Procesamiento
+    is_processed BOOLEAN DEFAULT FALSE,
+    ocr_text TEXT, -- Texto extraido por OCR
+    extracted_metadata JSONB,
+
+    -- Paginas (para PDFs/planos)
+    page_count INTEGER,
+    page_dimensions JSONB, -- Dimensiones por pagina
+
+    -- Cambios
+    change_summary TEXT,
+    change_type VARCHAR(50), -- major, minor, patch
+
+    -- Subido por
+    uploaded_by_id UUID,
+    uploaded_by_name VARCHAR(255),
+    upload_source VARCHAR(50), -- web, mobile, api, email
+
+    -- Auditoria
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    superseded_at TIMESTAMPTZ,
+    superseded_by_version_id UUID
+);
+
+-- ----------------------------------------------------------------------------
+-- 4. Permisos de Documentos
+-- ----------------------------------------------------------------------------
+CREATE TABLE documents.document_permissions (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    tenant_id UUID NOT NULL,
+
+    -- Objeto
+    document_id UUID REFERENCES documents.documents(id) ON DELETE CASCADE,
+    category_id UUID REFERENCES documents.document_categories(id) ON DELETE CASCADE,
+
+    -- Sujeto (quien tiene el permiso)
+    user_id UUID,
+    role_id UUID,
+    team_id UUID,
+
+    -- Permisos
+    can_view BOOLEAN DEFAULT FALSE,
+    can_download BOOLEAN DEFAULT FALSE,
+    can_edit BOOLEAN DEFAULT FALSE,
+    can_delete BOOLEAN DEFAULT FALSE,
+    can_share BOOLEAN DEFAULT FALSE,
+    can_approve BOOLEAN DEFAULT FALSE,
+    can_annotate BOOLEAN DEFAULT FALSE,
+
+    -- Vigencia
+    valid_from TIMESTAMPTZ,
+    valid_until TIMESTAMPTZ,
+
+    -- Otorgado por
+    granted_by_id UUID,
+    granted_at TIMESTAMPTZ DEFAULT NOW(),
+
+    -- Auditoria
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+
+    CONSTRAINT chk_permission_target CHECK (
+        (document_id IS NOT NULL AND category_id IS NULL) OR
+        (document_id IS NULL AND category_id IS NOT NULL)
+    ),
+    CONSTRAINT chk_permission_subject CHECK (
+        (user_id IS NOT NULL AND role_id IS NULL AND team_id IS NULL) OR
+        (user_id IS NULL AND role_id IS NOT NULL AND team_id IS NULL) OR
+        (user_id IS NULL AND role_id IS NULL AND team_id IS NOT NULL)
+    )
+);
+
+-- ----------------------------------------------------------------------------
+-- 5. Flujos de Aprobacion (Definicion)
+-- ----------------------------------------------------------------------------
+CREATE TABLE documents.approval_workflows (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    tenant_id UUID NOT NULL,
+
+    -- Identificacion
+    workflow_code VARCHAR(50) NOT NULL,
+    name VARCHAR(255) NOT NULL,
+    description TEXT,
+
+    -- Aplica a
+    category_id UUID REFERENCES documents.document_categories(id),
+    document_type documents.document_type,
+
+    -- Pasos (JSON array con la definicion)
+    steps JSONB NOT NULL, -- [{step_number, name, type, approvers[], required_count}]
+
+    -- Configuracion
+    allow_parallel BOOLEAN DEFAULT FALSE, -- Pasos pueden ser paralelos
+    allow_skip BOOLEAN DEFAULT FALSE, -- Permitir saltar pasos
+    auto_archive_on_approval BOOLEAN DEFAULT FALSE,
+
+    -- Estado
+    is_active BOOLEAN NOT NULL DEFAULT TRUE,
+
+    -- Metadatos
+    metadata JSONB,
+
+    -- Auditoria
+    created_by UUID,
+    updated_by UUID,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    deleted_at TIMESTAMPTZ,
+
+    CONSTRAINT uq_approval_workflows_tenant_code UNIQUE (tenant_id, workflow_code)
+);
+
+-- ----------------------------------------------------------------------------
+-- 6. Instancias de Flujo de Aprobacion
+-- ----------------------------------------------------------------------------
+CREATE TABLE documents.approval_instances (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    tenant_id UUID NOT NULL,
+
+    -- Flujo y documento
+    workflow_id UUID NOT NULL REFERENCES documents.approval_workflows(id),
+    document_id UUID NOT NULL REFERENCES documents.documents(id),
+    version_id UUID REFERENCES documents.document_versions(id),
+
+    -- Estado
+    status documents.workflow_status NOT NULL DEFAULT 'draft',
+    current_step INTEGER DEFAULT 1,
+    total_steps INTEGER NOT NULL,
+
+    -- Fechas
+    started_at TIMESTAMPTZ,
+    completed_at TIMESTAMPTZ,
+    due_date TIMESTAMPTZ,
+
+    -- Iniciador
+    initiated_by_id UUID,
+    initiated_by_name VARCHAR(255),
+
+    -- Resultado final
+    final_action documents.approval_action,
+    final_comments TEXT,
+    final_approver_id UUID,
+
+    -- Notas
+    notes TEXT,
+    metadata JSONB,
+
+    -- Auditoria
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- ----------------------------------------------------------------------------
+-- 7. Pasos de Aprobacion (Instancias)
+-- ----------------------------------------------------------------------------
+CREATE TABLE documents.approval_steps (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    tenant_id UUID NOT NULL,
+
+    -- Instancia
+    instance_id UUID NOT NULL REFERENCES documents.approval_instances(id) ON DELETE CASCADE,
+
+    -- Paso
+    step_number INTEGER NOT NULL,
+    step_name VARCHAR(255) NOT NULL,
+    step_type documents.approval_step_type NOT NULL,
+
+    -- Aprobadores requeridos
+    required_approvers UUID[], -- IDs de usuarios requeridos
+    required_count INTEGER DEFAULT 1, -- Cuantas aprobaciones se necesitan
+
+    -- Estado
+    status documents.workflow_status NOT NULL DEFAULT 'pending',
+
+    -- Fechas
+    started_at TIMESTAMPTZ,
+    completed_at TIMESTAMPTZ,
+    due_date TIMESTAMPTZ,
+
+    -- Resultado
+    action_taken documents.approval_action,
+    approved_by UUID[],
+    rejected_by UUID[],
+
+    -- Notas
+    notes TEXT,
+
+    -- Auditoria
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- ----------------------------------------------------------------------------
+-- 8. Acciones de Aprobacion
+-- ----------------------------------------------------------------------------
+CREATE TABLE documents.approval_actions (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    tenant_id UUID NOT NULL,
+
+    -- Paso
+    step_id UUID NOT NULL REFERENCES documents.approval_steps(id) ON DELETE CASCADE,
+    instance_id UUID NOT NULL REFERENCES documents.approval_instances(id),
+
+    -- Accion
+    action documents.approval_action NOT NULL,
+    comments TEXT,
+
+    -- Usuario que toma la accion
+    user_id UUID NOT NULL,
+    user_name VARCHAR(255),
+
+    -- Firma digital (si aplica)
+    signature_data TEXT,
+    signature_timestamp TIMESTAMPTZ,
+    signature_ip VARCHAR(45),
+
+    -- Auditoria
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- ----------------------------------------------------------------------------
+-- 9. Anotaciones sobre Documentos
+-- ----------------------------------------------------------------------------
+CREATE TABLE documents.annotations (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    tenant_id UUID NOT NULL,
+
+    -- Documento y version
+    document_id UUID NOT NULL REFERENCES documents.documents(id) ON DELETE CASCADE,
+    version_id UUID REFERENCES documents.document_versions(id),
+
+    -- Tipo
+    annotation_type documents.annotation_type NOT NULL,
+
+    -- Ubicacion en el documento
+    page_number INTEGER,
+    x_position DECIMAL(10,4),
+    y_position DECIMAL(10,4),
+    width DECIMAL(10,4),
+    height DECIMAL(10,4),
+    rotation DECIMAL(5,2),
+
+    -- Contenido
+    content TEXT, -- Texto del comentario o SVG del dibujo
+    style JSONB, -- Estilos (color, grosor, fuente, etc.)
+
+    -- Respuesta a otra anotacion
+    parent_annotation_id UUID REFERENCES documents.annotations(id),
+
+    -- Estado
+    is_resolved BOOLEAN DEFAULT FALSE,
+    resolved_by_id UUID,
+    resolved_at TIMESTAMPTZ,
+
+    -- Visibilidad
+    is_private BOOLEAN DEFAULT FALSE,
+    visible_to UUID[], -- Array de user_ids si es privado
+
+    -- Autor
+    author_id UUID NOT NULL,
+    author_name VARCHAR(255),
+
+    -- Auditoria
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    deleted_at TIMESTAMPTZ
+);
+
+-- ----------------------------------------------------------------------------
+-- 10. Historial de Acceso a Documentos
+-- ----------------------------------------------------------------------------
+CREATE TABLE documents.access_logs (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    tenant_id UUID NOT NULL,
+
+    -- Documento
+    document_id UUID NOT NULL REFERENCES documents.documents(id),
+    version_id UUID REFERENCES documents.document_versions(id),
+
+    -- Accion
+    action VARCHAR(50) NOT NULL, -- view, download, print, share, edit
+    action_details JSONB,
+
+    -- Usuario
+    user_id UUID NOT NULL,
+    user_name VARCHAR(255),
+    user_ip VARCHAR(45),
+    user_agent TEXT,
+
+    -- Contexto
+    session_id VARCHAR(100),
+    request_source VARCHAR(50), -- web, mobile, api
+
+    -- Timestamp
+    accessed_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- ----------------------------------------------------------------------------
+-- 11. Compartidos Externos
+-- ----------------------------------------------------------------------------
+CREATE TABLE documents.document_shares (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    tenant_id UUID NOT NULL,
+
+    -- Documento
+    document_id UUID NOT NULL REFERENCES documents.documents(id) ON DELETE CASCADE,
+    version_id UUID REFERENCES documents.document_versions(id),
+
+    -- Link compartido
+    share_token VARCHAR(100) NOT NULL UNIQUE,
+    share_url VARCHAR(2000),
+
+    -- Destinatario
+    shared_with_email VARCHAR(255),
+    shared_with_name VARCHAR(255),
+
+    -- Permisos
+    can_download BOOLEAN DEFAULT FALSE,
+    can_comment BOOLEAN DEFAULT FALSE,
+
+    -- Seguridad
+    password_hash VARCHAR(255), -- Si requiere password
+    max_downloads INTEGER,
+    download_count INTEGER DEFAULT 0,
+
+    -- Vigencia
+    expires_at TIMESTAMPTZ,
+    is_revoked BOOLEAN DEFAULT FALSE,
+    revoked_at TIMESTAMPTZ,
+    revoked_by_id UUID,
+
+    -- Compartido por
+    shared_by_id UUID NOT NULL,
+    shared_by_name VARCHAR(255),
+
+    -- Notificacion
+    notification_sent BOOLEAN DEFAULT FALSE,
+    notification_sent_at TIMESTAMPTZ,
+
+    -- Auditoria
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    last_accessed_at TIMESTAMPTZ
+);
+
+-- ============================================================================
+-- INDICES
+-- ============================================================================
+
+-- Document Categories
+CREATE INDEX idx_document_categories_tenant ON documents.document_categories(tenant_id);
+CREATE INDEX idx_document_categories_parent ON documents.document_categories(parent_id);
+
+-- Documents
+CREATE INDEX idx_documents_tenant ON documents.documents(tenant_id);
+CREATE INDEX idx_documents_tenant_category ON documents.documents(tenant_id, category_id);
+CREATE INDEX idx_documents_tenant_type ON documents.documents(tenant_id, document_type);
+CREATE INDEX idx_documents_tenant_status ON documents.documents(tenant_id, status);
+CREATE INDEX idx_documents_tenant_project ON documents.documents(tenant_id, project_id);
+CREATE INDEX idx_documents_keywords ON documents.documents USING gin(keywords);
+CREATE INDEX idx_documents_tags ON documents.documents USING gin(tags);
+CREATE INDEX idx_documents_fulltext ON documents.documents USING gin(
+    to_tsvector('spanish', coalesce(title, '') || ' ' || coalesce(description, ''))
+);
+
+-- Document Versions
+CREATE INDEX idx_document_versions_tenant ON documents.document_versions(tenant_id);
+CREATE INDEX idx_document_versions_document ON documents.document_versions(document_id);
+CREATE INDEX idx_document_versions_status ON documents.document_versions(status);
+
+-- Document Permissions
+CREATE INDEX idx_document_permissions_document ON documents.document_permissions(document_id);
+CREATE INDEX idx_document_permissions_category ON documents.document_permissions(category_id);
+CREATE INDEX idx_document_permissions_user ON documents.document_permissions(user_id);
+CREATE INDEX idx_document_permissions_role ON documents.document_permissions(role_id);
+
+-- Approval Workflows
+CREATE INDEX idx_approval_workflows_tenant ON documents.approval_workflows(tenant_id);
+CREATE INDEX idx_approval_workflows_category ON documents.approval_workflows(category_id);
+
+-- Approval Instances
+CREATE INDEX idx_approval_instances_tenant ON documents.approval_instances(tenant_id);
+CREATE INDEX idx_approval_instances_document ON documents.approval_instances(document_id);
+CREATE INDEX idx_approval_instances_status ON documents.approval_instances(status);
+
+-- Approval Steps
+CREATE INDEX idx_approval_steps_instance ON documents.approval_steps(instance_id);
+CREATE INDEX idx_approval_steps_status ON documents.approval_steps(status);
+
+-- Approval Actions
+CREATE INDEX idx_approval_actions_step ON documents.approval_actions(step_id);
+CREATE INDEX idx_approval_actions_user ON documents.approval_actions(user_id);
+
+-- Annotations
+CREATE INDEX idx_annotations_tenant ON documents.annotations(tenant_id);
+CREATE INDEX idx_annotations_document ON documents.annotations(document_id);
+CREATE INDEX idx_annotations_version ON documents.annotations(version_id);
+CREATE INDEX idx_annotations_author ON documents.annotations(author_id);
+
+-- Access Logs
+CREATE INDEX idx_access_logs_tenant ON documents.access_logs(tenant_id);
+CREATE INDEX idx_access_logs_document ON documents.access_logs(document_id);
+CREATE INDEX idx_access_logs_user ON documents.access_logs(user_id);
+CREATE INDEX idx_access_logs_accessed ON documents.access_logs(accessed_at);
+
+-- Document Shares
+CREATE INDEX idx_document_shares_tenant ON documents.document_shares(tenant_id);
+CREATE INDEX idx_document_shares_document ON documents.document_shares(document_id);
+CREATE INDEX idx_document_shares_token ON documents.document_shares(share_token);
+
+-- ============================================================================
+-- ROW LEVEL SECURITY (RLS)
+-- ============================================================================
+
+ALTER TABLE documents.document_categories ENABLE ROW LEVEL SECURITY;
+ALTER TABLE documents.documents ENABLE ROW LEVEL SECURITY;
+ALTER TABLE documents.document_versions ENABLE ROW LEVEL SECURITY;
+ALTER TABLE documents.document_permissions ENABLE ROW LEVEL SECURITY;
+ALTER TABLE documents.approval_workflows ENABLE ROW LEVEL SECURITY;
+ALTER TABLE documents.approval_instances ENABLE ROW LEVEL SECURITY;
+ALTER TABLE documents.approval_steps ENABLE ROW LEVEL SECURITY;
+ALTER TABLE documents.approval_actions ENABLE ROW LEVEL SECURITY;
+ALTER TABLE documents.annotations ENABLE ROW LEVEL SECURITY;
+ALTER TABLE documents.access_logs ENABLE ROW LEVEL SECURITY;
+ALTER TABLE documents.document_shares ENABLE ROW LEVEL SECURITY;
+
+-- ============================================================================
+-- TRIGGERS DE AUDITORIA
+-- ============================================================================
+
+CREATE OR REPLACE FUNCTION documents.set_updated_at()
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_at = NOW();
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trg_document_categories_updated_at
+    BEFORE UPDATE ON documents.document_categories
+    FOR EACH ROW EXECUTE FUNCTION documents.set_updated_at();
+
+CREATE TRIGGER trg_documents_updated_at
+    BEFORE UPDATE ON documents.documents
+    FOR EACH ROW EXECUTE FUNCTION documents.set_updated_at();
+
+CREATE TRIGGER trg_document_permissions_updated_at
+    BEFORE UPDATE ON documents.document_permissions
+    FOR EACH ROW EXECUTE FUNCTION documents.set_updated_at();
+
+CREATE TRIGGER trg_approval_workflows_updated_at
+    BEFORE UPDATE ON documents.approval_workflows
+    FOR EACH ROW EXECUTE FUNCTION documents.set_updated_at();
+
+CREATE TRIGGER trg_approval_instances_updated_at
+    BEFORE UPDATE ON documents.approval_instances
+    FOR EACH ROW EXECUTE FUNCTION documents.set_updated_at();
+
+CREATE TRIGGER trg_approval_steps_updated_at
+    BEFORE UPDATE ON documents.approval_steps
+    FOR EACH ROW EXECUTE FUNCTION documents.set_updated_at();
+
+CREATE TRIGGER trg_annotations_updated_at
+    BEFORE UPDATE ON documents.annotations
+    FOR EACH ROW EXECUTE FUNCTION documents.set_updated_at();
+
+-- ============================================================================
+-- FUNCIONES AUXILIARES
+-- ============================================================================
+
+-- Actualizar version actual del documento
+CREATE OR REPLACE FUNCTION documents.update_current_version()
+RETURNS TRIGGER AS $$
+BEGIN
+    IF NEW.status = 'current' THEN
+        -- Marcar versiones anteriores como superseded
+        UPDATE documents.document_versions
+        SET status = 'superseded',
+            superseded_at = NOW(),
+            superseded_by_version_id = NEW.id
+        WHERE document_id = NEW.document_id
+          AND id != NEW.id
+          AND status = 'current';
+
+        -- Actualizar documento con version actual
+        UPDATE documents.documents
+        SET current_version_id = NEW.id,
+            current_version_number = NEW.version_number,
+            updated_at = NOW()
+        WHERE id = NEW.document_id;
+    END IF;
+
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trg_update_current_version
+    AFTER INSERT OR UPDATE ON documents.document_versions
+    FOR EACH ROW EXECUTE FUNCTION documents.update_current_version();
+
+-- Incrementar contador de vistas
+CREATE OR REPLACE FUNCTION documents.increment_view_count()
+RETURNS TRIGGER AS $$
+BEGIN
+    IF NEW.action = 'view' THEN
+        UPDATE documents.documents
+        SET view_count = view_count + 1,
+            last_accessed_at = NOW()
+        WHERE id = NEW.document_id;
+    ELSIF NEW.action = 'download' THEN
+        UPDATE documents.documents
+        SET download_count = download_count + 1,
+            last_accessed_at = NOW()
+        WHERE id = NEW.document_id;
+    END IF;
+
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trg_increment_view_count
+    AFTER INSERT ON documents.access_logs
+    FOR EACH ROW EXECUTE FUNCTION documents.increment_view_count();
+
+-- Actualizar path de categoria
+CREATE OR REPLACE FUNCTION documents.update_category_path()
+RETURNS TRIGGER AS $$
+DECLARE
+    v_parent_path VARCHAR(500);
+BEGIN
+    IF NEW.parent_id IS NULL THEN
+        NEW.path := '/' || NEW.code;
+        NEW.level := 1;
+    ELSE
+        SELECT path, level + 1 INTO v_parent_path, NEW.level
+        FROM documents.document_categories
+        WHERE id = NEW.parent_id;
+
+        NEW.path := v_parent_path || '/' || NEW.code;
+    END IF;
+
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trg_update_category_path
+    BEFORE INSERT OR UPDATE ON documents.document_categories
+    FOR EACH ROW EXECUTE FUNCTION documents.update_category_path();
+
+-- ============================================================================
+-- COMENTARIOS DE DOCUMENTACION
+-- ============================================================================
+
+COMMENT ON SCHEMA documents IS 'Modulo de Gestion Documental (MAE-016) - ERP Construccion';
+
+COMMENT ON TABLE documents.document_categories IS 'Categorias jerarquicas para clasificar documentos';
+COMMENT ON TABLE documents.documents IS 'Registro principal de documentos';
+COMMENT ON TABLE documents.document_versions IS 'Versiones de documentos con archivos';
+COMMENT ON TABLE documents.document_permissions IS 'Permisos granulares por documento o categoria';
+COMMENT ON TABLE documents.approval_workflows IS 'Definicion de flujos de aprobacion';
+COMMENT ON TABLE documents.approval_instances IS 'Instancias de flujos de aprobacion activos';
+COMMENT ON TABLE documents.approval_steps IS 'Pasos de aprobacion por instancia';
+COMMENT ON TABLE documents.approval_actions IS 'Acciones tomadas en pasos de aprobacion';
+COMMENT ON TABLE documents.annotations IS 'Anotaciones y comentarios sobre documentos';
+COMMENT ON TABLE documents.access_logs IS 'Historial de acceso a documentos';
+COMMENT ON TABLE documents.document_shares IS 'Links de compartido externo';
+
+-- ============================================================================
+-- FIN DEL SCRIPT
+-- ============================================================================