diff --git a/schema/01-core-hierarchy.sql b/schema/01-core-hierarchy.sql
new file mode 100644
index 0000000..ab246d5
--- /dev/null
+++ b/schema/01-core-hierarchy.sql
@@ -0,0 +1,218 @@
+-- ==========================================
+-- CLUB DAGUERRE CAMERA DATABASE
+-- Part 1: Core Hierarchy
+-- ==========================================
+
+-- Enable required extensions
+CREATE EXTENSION IF NOT EXISTS btree_gist;
+
+-- ==========================================
+-- MANUFACTURERS
+-- ==========================================
+CREATE TABLE manufacturers (
+  id SERIAL PRIMARY KEY,
+  goergens_code VARCHAR(4) UNIQUE NOT NULL,
+  name VARCHAR(200) NOT NULL,
+  country VARCHAR(3),
+  years_active INT4RANGE,
+  
+  -- Audit
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  created_by INT,
+  updated_at TIMESTAMP,
+  updated_by INT,
+  version INT DEFAULT 1,
+  deleted_at TIMESTAMP,
+  
+  CONSTRAINT chk_mfg_code CHECK (goergens_code ~ '^[A-Z]{2,4}$')
+);
+
+CREATE INDEX idx_mfg_name ON manufacturers(name);
+CREATE INDEX idx_mfg_country ON manufacturers(country);
+CREATE INDEX idx_mfg_active ON manufacturers(id) WHERE deleted_at IS NULL;
+
+COMMENT ON TABLE manufacturers IS 'Camera manufacturers - top level of Goergens hierarchy';
+COMMENT ON COLUMN manufacturers.goergens_code IS 'Goergens manufacturer code (e.g., ERNM, ZEII)';
+
+-- ==========================================
+-- CAMERA MODELS
+-- ==========================================
+CREATE TABLE camera_models (
+  id SERIAL PRIMARY KEY,
+  manufacturer_id INT NOT NULL REFERENCES manufacturers(id),
+  goergens_model_number VARCHAR(10) NOT NULL,
+  
+  -- Goergens classification codes
+  body_type VARCHAR(2) NOT NULL,
+  viewfinder_type VARCHAR(4),
+  format_code VARCHAR(20) NOT NULL,
+  
+  -- Production years
+  year_first INT,
+  year_last INT,
+  
+  -- Audit
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  created_by INT,
+  updated_at TIMESTAMP,
+  updated_by INT,
+  version INT DEFAULT 1,
+  deleted_at TIMESTAMP,
+  
+  UNIQUE(manufacturer_id, goergens_model_number),
+  CONSTRAINT chk_years CHECK (year_first IS NULL OR year_last IS NULL OR year_first <= year_last),
+  CONSTRAINT chk_body_type CHECK (body_type ~ '^[A-Z][a-z]?$')
+);
+
+CREATE INDEX idx_models_manufacturer ON camera_models(manufacturer_id);
+CREATE INDEX idx_models_type ON camera_models(body_type, viewfinder_type);
+CREATE INDEX idx_models_format ON camera_models(format_code);
+CREATE INDEX idx_models_years ON camera_models(year_first, year_last);
+CREATE INDEX idx_models_active ON camera_models(id) WHERE deleted_at IS NULL;
+
+COMMENT ON TABLE camera_models IS 'Camera models - grouping level in Goergens system';
+COMMENT ON COLUMN camera_models.goergens_model_number IS 'Model number from Goergens ID (e.g., 1910 for Bob IV)';
+
+-- ==========================================
+-- CAMERA MODEL I18N
+-- ==========================================
+CREATE TABLE camera_model_i18n (
+  camera_model_id INT PRIMARY KEY REFERENCES camera_models(id) ON DELETE CASCADE,
+  
+  model_name VARCHAR(200),
+  description_de TEXT,
+  description_en TEXT,
+  marketing_name_de VARCHAR(200),
+  marketing_name_en VARCHAR(200),
+  
+  -- Full-text search vectors
+  search_vector_de TSVECTOR GENERATED ALWAYS AS (
+    to_tsvector('german', COALESCE(model_name, '') || ' ' || COALESCE(description_de, ''))
+  ) STORED,
+  search_vector_en TSVECTOR GENERATED ALWAYS AS (
+    to_tsvector('english', COALESCE(model_name, '') || ' ' || COALESCE(description_en, ''))
+  ) STORED
+);
+
+CREATE INDEX idx_i18n_fts_de ON camera_model_i18n USING GIN(search_vector_de);
+CREATE INDEX idx_i18n_fts_en ON camera_model_i18n USING GIN(search_vector_en);
+
+COMMENT ON TABLE camera_model_i18n IS 'Multilingual content for camera models';
+
+-- ==========================================
+-- HOUSING VARIANTS
+-- ==========================================
+CREATE TABLE housing_variants (
+  id SERIAL PRIMARY KEY,
+  camera_model_id INT NOT NULL REFERENCES camera_models(id) ON DELETE CASCADE,
+  goergens_variant_letter VARCHAR(2) NOT NULL,
+  
+  color VARCHAR(50),
+  body_material VARCHAR(50),
+  distinguishing_features TEXT,
+  
+  -- Audit
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  created_by INT,
+  updated_at TIMESTAMP,
+  updated_by INT,
+  version INT DEFAULT 1,
+  deleted_at TIMESTAMP,
+  
+  UNIQUE(camera_model_id, goergens_variant_letter),
+  CONSTRAINT chk_variant_letter CHECK (goergens_variant_letter ~ '^[a-z]{1,2}$')
+);
+
+CREATE INDEX idx_variants_model ON housing_variants(camera_model_id);
+CREATE INDEX idx_variants_active ON housing_variants(id) WHERE deleted_at IS NULL;
+
+COMMENT ON TABLE housing_variants IS 'Housing variants - color, material variations';
+COMMENT ON COLUMN housing_variants.goergens_variant_letter IS 'Variant letter from Goergens ID (a, b, c, etc.)';
+
+-- ==========================================
+-- LENS/SHUTTER COMBINATIONS
+-- ==========================================
+CREATE TABLE lens_shutter_combos (
+  id SERIAL PRIMARY KEY,
+  housing_variant_id INT NOT NULL REFERENCES housing_variants(id) ON DELETE CASCADE,
+  goergens_combo_number VARCHAR(3) NOT NULL,
+  
+  lens_id INT,
+  shutter_id INT,
+  
+  -- DENORMALIZED FIELDS FOR PERFORMANCE
+  manufacturer_id INT,
+  camera_model_id INT,
+  goergens_full_id VARCHAR(50),
+  display_name TEXT,
+  
+  -- STRUCTURED TECHNICAL SPECS
+  weight_g INT,
+  width_mm DECIMAL(6,2),
+  height_mm DECIMAL(6,2),
+  depth_mm DECIMAL(6,2),
+  
+  -- FLEXIBLE SPECS (JSONB)
+  specs JSONB,
+  
+  -- Full-text search
+  search_text TEXT,
+  
+  -- Audit
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  created_by INT,
+  updated_at TIMESTAMP,
+  updated_by INT,
+  version INT DEFAULT 1,
+  deleted_at TIMESTAMP,
+  
+  UNIQUE(housing_variant_id, goergens_combo_number),
+  CONSTRAINT chk_weight CHECK (weight_g IS NULL OR (weight_g > 0 AND weight_g < 50000)),
+  CONSTRAINT chk_dimensions CHECK (
+    width_mm IS NULL OR height_mm IS NULL OR depth_mm IS NULL OR
+    (width_mm > 0 AND height_mm > 0 AND depth_mm > 0)
+  )
+);
+
+-- Critical indexes
+CREATE INDEX idx_combos_variant ON lens_shutter_combos(housing_variant_id);
+CREATE INDEX idx_combos_lens ON lens_shutter_combos(lens_id);
+CREATE INDEX idx_combos_shutter ON lens_shutter_combos(shutter_id);
+
+-- Denormalized indexes (performance boost)
+CREATE INDEX idx_combos_manufacturer ON lens_shutter_combos(manufacturer_id);
+CREATE INDEX idx_combos_model ON lens_shutter_combos(camera_model_id);
+CREATE INDEX idx_combos_goergens_id ON lens_shutter_combos(goergens_full_id);
+
+-- JSONB and full-text search
+CREATE INDEX idx_combos_specs ON lens_shutter_combos USING GIN(specs);
+CREATE INDEX idx_combos_fts ON lens_shutter_combos USING GIN(to_tsvector('german', COALESCE(search_text, '')));
+CREATE INDEX idx_combos_active ON lens_shutter_combos(id) WHERE deleted_at IS NULL;
+
+COMMENT ON TABLE lens_shutter_combos IS 'Lens/shutter combinations - lowest level of hierarchy';
+COMMENT ON COLUMN lens_shutter_combos.goergens_full_id IS 'Complete Goergens ID (e.g., ERNM K 1910 a01)';
+COMMENT ON COLUMN lens_shutter_combos.specs IS 'Flexible technical specs as JSON (body_material, bellows_color, etc.)';
+
+-- ==========================================
+-- CAMERA RELATIONSHIPS
+-- ==========================================
+CREATE TABLE camera_relations (
+  id SERIAL PRIMARY KEY,
+  source_combo_id INT NOT NULL REFERENCES lens_shutter_combos(id) ON DELETE CASCADE,
+  related_combo_id INT NOT NULL REFERENCES lens_shutter_combos(id) ON DELETE CASCADE,
+  relationship_type VARCHAR(50) NOT NULL,
+  notes TEXT,
+  
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  created_by INT,
+  
+  UNIQUE(source_combo_id, related_combo_id, relationship_type),
+  CONSTRAINT chk_not_self CHECK (source_combo_id != related_combo_id),
+  CONSTRAINT chk_relationship_type CHECK (relationship_type IN ('successor', 'predecessor', 'similar', 'variant_of', 'replaced_by'))
+);
+
+CREATE INDEX idx_relations_source ON camera_relations(source_combo_id);
+CREATE INDEX idx_relations_target ON camera_relations(related_combo_id);
+CREATE INDEX idx_relations_type ON camera_relations(relationship_type);
+
+COMMENT ON TABLE camera_relations IS 'Relationships between cameras (evolution, variants, etc.)';
diff --git a/schema/02-supporting.sql b/schema/02-supporting.sql
new file mode 100644
index 0000000..bd18526
--- /dev/null
+++ b/schema/02-supporting.sql
@@ -0,0 +1,167 @@
+-- ==========================================
+-- CLUB DAGUERRE CAMERA DATABASE
+-- Part 2: Supporting Data
+-- ==========================================
+
+-- ==========================================
+-- LENSES
+-- ==========================================
+CREATE TABLE lenses (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR(200) NOT NULL,
+  manufacturer VARCHAR(100),
+  focal_length_mm INT,
+  max_aperture DECIMAL(3,1),
+  lens_type VARCHAR(50),
+  mount_type VARCHAR(50),
+  
+  notes TEXT,
+  
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  created_by INT,
+  updated_at TIMESTAMP,
+  updated_by INT,
+  
+  CONSTRAINT chk_focal_length CHECK (focal_length_mm IS NULL OR focal_length_mm > 0),
+  CONSTRAINT chk_aperture CHECK (max_aperture IS NULL OR (max_aperture > 0 AND max_aperture < 32))
+);
+
+CREATE INDEX idx_lenses_name ON lenses(name);
+CREATE INDEX idx_lenses_mfg ON lenses(manufacturer);
+CREATE INDEX idx_lenses_focal ON lenses(focal_length_mm);
+CREATE INDEX idx_lenses_aperture ON lenses(max_aperture);
+
+COMMENT ON TABLE lenses IS 'Lens catalog - reusable across cameras';
+
+-- Add foreign key to lens_shutter_combos
+ALTER TABLE lens_shutter_combos 
+ADD CONSTRAINT fk_lens FOREIGN KEY (lens_id) REFERENCES lenses(id);
+
+-- ==========================================
+-- SHUTTERS
+-- ==========================================
+CREATE TABLE shutters (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR(100) NOT NULL,
+  manufacturer VARCHAR(100),
+  shutter_type VARCHAR(50),
+  speed_range VARCHAR(100),
+  
+  notes TEXT,
+  
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  created_by INT,
+  updated_at TIMESTAMP,
+  updated_by INT
+);
+
+CREATE INDEX idx_shutters_name ON shutters(name);
+CREATE INDEX idx_shutters_type ON shutters(shutter_type);
+
+COMMENT ON TABLE shutters IS 'Shutter catalog - reusable across cameras';
+
+-- Add foreign key to lens_shutter_combos
+ALTER TABLE lens_shutter_combos 
+ADD CONSTRAINT fk_shutter FOREIGN KEY (shutter_id) REFERENCES shutters(id);
+
+-- ==========================================
+-- FILM FORMATS
+-- ==========================================
+CREATE TABLE formats (
+  id SERIAL PRIMARY KEY,
+  format_code VARCHAR(20) UNIQUE NOT NULL,
+  width_mm DECIMAL(6,2),
+  height_mm DECIMAL(6,2),
+  format_type VARCHAR(20),
+  
+  description_de TEXT,
+  description_en TEXT,
+  
+  sort_order INT
+);
+
+CREATE INDEX idx_formats_code ON formats(format_code);
+CREATE INDEX idx_formats_type ON formats(format_type);
+
+COMMENT ON TABLE formats IS 'Film format definitions';
+
+-- ==========================================
+-- CONCEPTS (Multilingual Terminology)
+-- ==========================================
+CREATE TABLE concepts (
+  id SERIAL PRIMARY KEY,
+  concept_code VARCHAR(50) UNIQUE NOT NULL,
+  category VARCHAR(50) NOT NULL,
+  sort_order INT DEFAULT 0
+);
+
+COMMENT ON TABLE concepts IS 'Terminology concepts - language-agnostic';
+
+-- ==========================================
+-- CONCEPT TERMS (Translations)
+-- ==========================================
+CREATE TABLE concept_terms (
+  id SERIAL PRIMARY KEY,
+  concept_id INT NOT NULL REFERENCES concepts(id) ON DELETE CASCADE,
+  language_code VARCHAR(5) NOT NULL,
+  term VARCHAR(200) NOT NULL,
+  term_type VARCHAR(20) NOT NULL,
+  
+  UNIQUE(concept_id, language_code, term_type),
+  CONSTRAINT chk_term_type CHECK (term_type IN ('primary', 'abbreviation', 'synonym'))
+);
+
+CREATE INDEX idx_terms_concept ON concept_terms(concept_id);
+CREATE INDEX idx_terms_language ON concept_terms(language_code);
+CREATE INDEX idx_terms_term ON concept_terms(term);
+
+COMMENT ON TABLE concept_terms IS 'Multilingual terms for concepts';
+
+-- ==========================================
+-- TERMINOLOGY VIEW (Backwards Compatibility)
+-- ==========================================
+CREATE VIEW terminology AS
+SELECT 
+  c.concept_code,
+  c.category,
+  MAX(CASE WHEN ct.language_code = 'de' AND ct.term_type = 'primary' THEN ct.term END) AS term_de,
+  MAX(CASE WHEN ct.language_code = 'en' AND ct.term_type = 'primary' THEN ct.term END) AS term_en,
+  MAX(CASE WHEN ct.language_code = 'de' AND ct.term_type = 'abbreviation' THEN ct.term END) AS abbreviation
+FROM concepts c
+LEFT JOIN concept_terms ct ON c.id = ct.concept_id
+GROUP BY c.concept_code, c.category;
+
+COMMENT ON VIEW terminology IS 'Simple view of German/English terms for quick lookups';
+
+-- ==========================================
+-- SERIAL NUMBERS (Authentication Database)
+-- ==========================================
+CREATE TABLE serial_numbers (
+  id SERIAL PRIMARY KEY,
+  camera_model_id INT NOT NULL REFERENCES camera_models(id) ON DELETE CASCADE,
+  
+  -- PostgreSQL range types for proper validation
+  serial_range INT4RANGE NOT NULL,
+  year_range INT4RANGE NOT NULL,
+  
+  variant_notes VARCHAR(200),
+  production_notes TEXT,
+  source VARCHAR(200),
+  
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  created_by INT,
+  updated_at TIMESTAMP,
+  
+  -- Prevent overlapping serial ranges
+  CONSTRAINT no_serial_overlap EXCLUDE USING GIST (
+    camera_model_id WITH =,
+    serial_range WITH &&
+  )
+);
+
+CREATE INDEX idx_serials_model ON serial_numbers(camera_model_id);
+CREATE INDEX idx_serials_range ON serial_numbers USING GIST(serial_range);
+CREATE INDEX idx_serials_year ON serial_numbers USING GIST(year_range);
+
+COMMENT ON TABLE serial_numbers IS 'Serial number ranges for camera authentication';
+COMMENT ON COLUMN serial_numbers.serial_range IS 'Query: WHERE serial_range @> 52103 to check if serial is genuine';
diff --git a/schema/03-content.sql b/schema/03-content.sql
new file mode 100644
index 0000000..ce21a89
--- /dev/null
+++ b/schema/03-content.sql
@@ -0,0 +1,294 @@
+-- ==========================================
+-- CLUB DAGUERRE CAMERA DATABASE
+-- Part 3: Content & Media
+-- ==========================================
+
+-- ==========================================
+-- CONTENT SOURCES (Provenance Tracking)
+-- ==========================================
+CREATE TABLE content_sources (
+  id SERIAL PRIMARY KEY,
+  source_name VARCHAR(100) NOT NULL,
+  source_type VARCHAR(50) NOT NULL,
+  rights_status VARCHAR(50) NOT NULL,
+  legal_notes TEXT,
+  contact_info TEXT,
+  verified_by VARCHAR(100),
+  verified_date DATE,
+  
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  
+  CONSTRAINT chk_source_type CHECK (source_type IN ('internal', 'licensed', 'uncertain', 'public_domain')),
+  CONSTRAINT chk_rights_status CHECK (rights_status IN ('owned', 'licensed', 'questionable', 'public_domain'))
+);
+
+COMMENT ON TABLE content_sources IS 'Provenance tracking for all content';
+
+-- ==========================================
+-- IMAGES (Unified with Rights Status)
+-- ==========================================
+CREATE TABLE images (
+  id SERIAL PRIMARY KEY,
+  filename VARCHAR(255) NOT NULL,
+  sort_order INT NOT NULL DEFAULT 0,
+  caption TEXT,
+  
+  -- FLEXIBLE MULTI-LEVEL LINKING (only ONE should be set)
+  manufacturer_id INT REFERENCES manufacturers(id),
+  camera_model_id INT REFERENCES camera_models(id),
+  housing_variant_id INT REFERENCES housing_variants(id),
+  combo_id INT REFERENCES lens_shutter_combos(id),
+  
+  -- RIGHTS MANAGEMENT
+  rights_status VARCHAR(20) NOT NULL,
+  source_id INT NOT NULL REFERENCES content_sources(id),
+  
+  -- Verified images
+  photographer VARCHAR(100),
+  photo_date DATE,
+  rights_holder VARCHAR(200),
+  license_type VARCHAR(50),
+  
+  -- Uncertain images
+  why_uncertain TEXT,
+  usage_restriction VARCHAR(50),
+  clearance_status VARCHAR(50),
+  
+  -- Metadata
+  file_size_kb INT,
+  width_px INT,
+  height_px INT,
+  mime_type VARCHAR(50),
+  
+  -- Audit
+  uploaded_by INT,
+  upload_date TIMESTAMP NOT NULL DEFAULT NOW(),
+  verified_clean BOOLEAN DEFAULT FALSE,
+  verified_by VARCHAR(100),
+  verified_date DATE,
+  updated_at TIMESTAMP,
+  deleted_at TIMESTAMP,
+  
+  -- Exactly ONE link must be set
+  CONSTRAINT chk_image_link CHECK (
+    (manufacturer_id IS NOT NULL AND camera_model_id IS NULL AND housing_variant_id IS NULL AND combo_id IS NULL) OR
+    (manufacturer_id IS NULL AND camera_model_id IS NOT NULL AND housing_variant_id IS NULL AND combo_id IS NULL) OR
+    (manufacturer_id IS NULL AND camera_model_id IS NULL AND housing_variant_id IS NOT NULL AND combo_id IS NULL) OR
+    (manufacturer_id IS NULL AND camera_model_id IS NULL AND housing_variant_id IS NULL AND combo_id IS NOT NULL)
+  ),
+  CONSTRAINT chk_rights_status CHECK (rights_status IN ('verified', 'uncertain', 'restricted')),
+  CONSTRAINT chk_uncertain_fields CHECK (
+    (rights_status = 'uncertain' AND why_uncertain IS NOT NULL) OR
+    (rights_status = 'verified' AND why_uncertain IS NULL)
+  ),
+  CONSTRAINT chk_sort_order CHECK (sort_order >= 0)
+);
+
+-- Indexes for each link type
+CREATE INDEX idx_images_manufacturer ON images(manufacturer_id) WHERE manufacturer_id IS NOT NULL;
+CREATE INDEX idx_images_model ON images(camera_model_id) WHERE camera_model_id IS NOT NULL;
+CREATE INDEX idx_images_variant ON images(housing_variant_id) WHERE housing_variant_id IS NOT NULL;
+CREATE INDEX idx_images_combo ON images(combo_id) WHERE combo_id IS NOT NULL;
+
+CREATE INDEX idx_images_source ON images(source_id);
+CREATE INDEX idx_images_status ON images(rights_status);
+
+-- Partial indexes for performance
+CREATE INDEX idx_images_verified_model ON images(camera_model_id, sort_order) 
+WHERE rights_status = 'verified' AND camera_model_id IS NOT NULL;
+
+CREATE INDEX idx_images_uncertain ON images(camera_model_id) 
+WHERE rights_status = 'uncertain' AND camera_model_id IS NOT NULL;
+
+CREATE INDEX idx_images_primary ON images(camera_model_id) 
+WHERE sort_order = 0 AND rights_status = 'verified' AND camera_model_id IS NOT NULL;
+
+COMMENT ON TABLE images IS 'Images with multi-level linking and rights management';
+COMMENT ON COLUMN images.rights_status IS 'verified=publishable, uncertain=research only, restricted=internal only';
+
+-- ==========================================
+-- DOCUMENTS (Manuals, Brochures, etc.)
+-- ==========================================
+CREATE TABLE documents (
+  id SERIAL PRIMARY KEY,
+  
+  -- FLEXIBLE MULTI-LEVEL LINKING (only ONE should be set)
+  manufacturer_id INT REFERENCES manufacturers(id),
+  camera_model_id INT REFERENCES camera_models(id),
+  housing_variant_id INT REFERENCES housing_variants(id),
+  combo_id INT REFERENCES lens_shutter_combos(id),
+  
+  -- Document classification
+  document_type VARCHAR(50) NOT NULL,
+  
+  file_path VARCHAR(500),
+  title TEXT,
+  language VARCHAR(5),
+  page_count INT,
+  publication_date DATE,
+  
+  -- Rights
+  rights_status VARCHAR(20) DEFAULT 'safe',
+  source_id INT REFERENCES content_sources(id),
+  why_safe TEXT,
+  
+  -- Metadata
+  file_size_kb INT,
+  mime_type VARCHAR(50),
+  
+  -- Audit
+  uploaded_by INT,
+  upload_date TIMESTAMP NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMP,
+  deleted_at TIMESTAMP,
+  
+  -- Exactly ONE link must be set
+  CONSTRAINT chk_doc_link CHECK (
+    (manufacturer_id IS NOT NULL AND camera_model_id IS NULL AND housing_variant_id IS NULL AND combo_id IS NULL) OR
+    (manufacturer_id IS NULL AND camera_model_id IS NOT NULL AND housing_variant_id IS NULL AND combo_id IS NULL) OR
+    (manufacturer_id IS NULL AND camera_model_id IS NULL AND housing_variant_id IS NOT NULL AND combo_id IS NULL) OR
+    (manufacturer_id IS NULL AND camera_model_id IS NULL AND housing_variant_id IS NULL AND combo_id IS NOT NULL)
+  ),
+  CONSTRAINT chk_doc_type CHECK (document_type IN (
+    'user_manual', 'repair_manual', 'brochure', 'advertisement', 
+    'price_list', 'catalog', 'technical_spec', 'patent', 'parts_list'
+  ))
+);
+
+-- Indexes for each link type
+CREATE INDEX idx_docs_manufacturer ON documents(manufacturer_id) WHERE manufacturer_id IS NOT NULL;
+CREATE INDEX idx_docs_model ON documents(camera_model_id) WHERE camera_model_id IS NOT NULL;
+CREATE INDEX idx_docs_variant ON documents(housing_variant_id) WHERE housing_variant_id IS NOT NULL;
+CREATE INDEX idx_docs_combo ON documents(combo_id) WHERE combo_id IS NOT NULL;
+
+CREATE INDEX idx_docs_type ON documents(document_type);
+CREATE INDEX idx_docs_language ON documents(language);
+
+COMMENT ON TABLE documents IS 'Documents with multi-level linking - manuals, brochures, repair manuals, etc.';
+
+-- ==========================================
+-- ARTICLES
+-- ==========================================
+CREATE TABLE articles (
+  id SERIAL PRIMARY KEY,
+  
+  -- Publication info
+  publication_code VARCHAR(10),
+  issue_number INT,
+  year INT,
+  page INT,
+  
+  -- Content
+  title TEXT NOT NULL,
+  author VARCHAR(200),
+  language VARCHAR(5) DEFAULT 'de',
+  
+  content TEXT,
+  abstract TEXT,
+  
+  -- Rights management
+  rights_status VARCHAR(20) NOT NULL DEFAULT 'verified',
+  source_id INT REFERENCES content_sources(id),
+  publication_owns_rights BOOLEAN DEFAULT FALSE,
+  digitization_rights_cleared BOOLEAN DEFAULT FALSE,
+  
+  why_uncertain TEXT,
+  usage_restriction VARCHAR(50),
+  
+  -- Full-text search
+  search_vector TSVECTOR GENERATED ALWAYS AS (
+    to_tsvector('german', title || ' ' || COALESCE(author, '') || ' ' || COALESCE(abstract, ''))
+  ) STORED,
+  
+  -- Audit
+  digitized_by VARCHAR(100),
+  digitized_date DATE,
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  created_by INT,
+  updated_at TIMESTAMP,
+  deleted_at TIMESTAMP,
+  
+  CONSTRAINT chk_article_rights CHECK (
+    (rights_status = 'uncertain' AND content IS NULL) OR
+    (rights_status = 'verified')
+  )
+);
+
+CREATE INDEX idx_articles_pub ON articles(publication_code, issue_number);
+CREATE INDEX idx_articles_year ON articles(year);
+CREATE INDEX idx_articles_author ON articles(author);
+CREATE INDEX idx_articles_status ON articles(rights_status);
+CREATE INDEX idx_articles_fts ON articles USING GIN(search_vector);
+
+COMMENT ON TABLE articles IS 'Magazine articles - Photo Antiquaria, Club Daguerre aktuell, etc.';
+
+-- ==========================================
+-- CAMERA-ARTICLE LINKS (Many-to-Many with Multi-Level)
+-- ==========================================
+CREATE TABLE camera_articles (
+  id SERIAL PRIMARY KEY,
+  article_id INT NOT NULL REFERENCES articles(id) ON DELETE CASCADE,
+  
+  -- FLEXIBLE MULTI-LEVEL LINKING (only ONE should be set)
+  manufacturer_id INT REFERENCES manufacturers(id),
+  camera_model_id INT REFERENCES camera_models(id),
+  housing_variant_id INT REFERENCES housing_variants(id),
+  combo_id INT REFERENCES lens_shutter_combos(id),
+  
+  relevance VARCHAR(20),
+  
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  created_by INT,
+  
+  -- Exactly ONE link must be set
+  CONSTRAINT chk_article_link CHECK (
+    (manufacturer_id IS NOT NULL AND camera_model_id IS NULL AND housing_variant_id IS NULL AND combo_id IS NULL) OR
+    (manufacturer_id IS NULL AND camera_model_id IS NOT NULL AND housing_variant_id IS NULL AND combo_id IS NULL) OR
+    (manufacturer_id IS NULL AND camera_model_id IS NULL AND housing_variant_id IS NOT NULL AND combo_id IS NULL) OR
+    (manufacturer_id IS NULL AND camera_model_id IS NULL AND housing_variant_id IS NULL AND combo_id IS NOT NULL)
+  ),
+  CONSTRAINT chk_relevance CHECK (relevance IN ('primary', 'mentioned', 'comparison')),
+  UNIQUE(article_id, manufacturer_id, camera_model_id, housing_variant_id, combo_id)
+);
+
+CREATE INDEX idx_ca_article ON camera_articles(article_id);
+CREATE INDEX idx_ca_manufacturer ON camera_articles(manufacturer_id) WHERE manufacturer_id IS NOT NULL;
+CREATE INDEX idx_ca_model ON camera_articles(camera_model_id) WHERE camera_model_id IS NOT NULL;
+CREATE INDEX idx_ca_variant ON camera_articles(housing_variant_id) WHERE housing_variant_id IS NOT NULL;
+CREATE INDEX idx_ca_combo ON camera_articles(combo_id) WHERE combo_id IS NOT NULL;
+
+COMMENT ON TABLE camera_articles IS 'Links articles to cameras at appropriate hierarchy level';
+
+-- ==========================================
+-- ANNOTATIONS (User Contributions)
+-- ==========================================
+CREATE TABLE annotations (
+  id SERIAL PRIMARY KEY,
+  combo_id INT NOT NULL REFERENCES lens_shutter_combos(id) ON DELETE CASCADE,
+  annotation_type VARCHAR(50) NOT NULL,
+  
+  -- Bilingual content
+  content_de TEXT,
+  content_en TEXT,
+  source_language VARCHAR(5),
+  
+  -- Attribution
+  contributed_by INT,
+  contribution_date TIMESTAMP NOT NULL DEFAULT NOW(),
+  
+  -- Moderation
+  approved BOOLEAN DEFAULT FALSE,
+  approved_by INT,
+  approved_date TIMESTAMP,
+  
+  updated_at TIMESTAMP,
+  deleted_at TIMESTAMP,
+  
+  CONSTRAINT chk_annotation_type CHECK (annotation_type IN ('historical_note', 'anecdote', 'provenance', 'usage_note', 'technical_note'))
+);
+
+CREATE INDEX idx_annotations_combo ON annotations(combo_id);
+CREATE INDEX idx_annotations_type ON annotations(annotation_type);
+CREATE INDEX idx_annotations_approved ON annotations(approved);
+
+COMMENT ON TABLE annotations IS 'User-contributed notes and information';
diff --git a/schema/04-auth.sql b/schema/04-auth.sql
new file mode 100644
index 0000000..969b895
--- /dev/null
+++ b/schema/04-auth.sql
@@ -0,0 +1,129 @@
+-- ==========================================
+-- CLUB DAGUERRE CAMERA DATABASE
+-- Part 4: Authentication & Members
+-- ==========================================
+
+-- ==========================================
+-- MEMBERS (Tier 1 Authentication)
+-- ==========================================
+CREATE TABLE members (
+  id SERIAL PRIMARY KEY,
+  member_number VARCHAR(20) UNIQUE,
+  email VARCHAR(200) UNIQUE NOT NULL,
+  name VARCHAR(200) NOT NULL,
+  password_hash VARCHAR(255),
+  
+  -- Account status
+  account_active BOOLEAN DEFAULT TRUE,
+  member_since DATE,
+  membership_expires DATE,
+  
+  -- Permissions
+  can_view_public BOOLEAN DEFAULT TRUE,
+  can_view_member_content BOOLEAN DEFAULT TRUE,
+  can_contribute BOOLEAN DEFAULT FALSE,
+  is_admin BOOLEAN DEFAULT FALSE,
+  
+  -- Audit
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  last_login TIMESTAMP,
+  login_count INT DEFAULT 0
+);
+
+CREATE INDEX idx_members_email ON members(email);
+CREATE INDEX idx_members_number ON members(member_number);
+CREATE INDEX idx_members_active ON members(id) WHERE account_active = TRUE;
+
+COMMENT ON TABLE members IS 'Club members - basic authentication and permissions';
+
+-- ==========================================
+-- RESEARCH ACCESS (Tier 2 Authentication)
+-- ==========================================
+CREATE TABLE research_access (
+  id SERIAL PRIMARY KEY,
+  member_id INT NOT NULL REFERENCES members(id) ON DELETE CASCADE,
+  
+  has_research_access BOOLEAN DEFAULT FALSE,
+  access_granted_by VARCHAR(100),
+  access_granted_date DATE,
+  access_expires DATE,
+  
+  research_purpose TEXT,
+  institution VARCHAR(200),
+  
+  -- Usage tracking
+  access_count INT DEFAULT 0,
+  last_research_access TIMESTAMP,
+  
+  notes TEXT
+);
+
+CREATE INDEX idx_research_member ON research_access(member_id);
+CREATE INDEX idx_research_active ON research_access(member_id) 
+WHERE has_research_access = TRUE AND (access_expires IS NULL OR access_expires > CURRENT_DATE);
+
+COMMENT ON TABLE research_access IS 'Research access grants for viewing uncertain content';
+
+-- ==========================================
+-- RESEARCH SESSIONS
+-- ==========================================
+CREATE TABLE research_sessions (
+  id SERIAL PRIMARY KEY,
+  member_id INT NOT NULL REFERENCES members(id) ON DELETE CASCADE,
+  session_token VARCHAR(64) UNIQUE NOT NULL,
+  
+  ip_address INET,
+  user_agent TEXT,
+  
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  expires_at TIMESTAMP NOT NULL,
+  last_activity TIMESTAMP,
+  
+  resources_accessed TEXT[]
+);
+
+CREATE INDEX idx_sessions_member ON research_sessions(member_id);
+CREATE INDEX idx_sessions_token ON research_sessions(session_token);
+CREATE INDEX idx_sessions_active ON research_sessions(expires_at) 
+WHERE expires_at > NOW();
+
+COMMENT ON TABLE research_sessions IS 'Active research sessions for audit trail';
+
+-- ==========================================
+-- SYSTEM CONFIG (Shared Settings)
+-- ==========================================
+CREATE TABLE system_config (
+  key VARCHAR(100) PRIMARY KEY,
+  value TEXT,
+  description TEXT,
+  updated_by VARCHAR(100),
+  updated_at TIMESTAMP DEFAULT NOW()
+);
+
+COMMENT ON TABLE system_config IS 'System-wide configuration (including research password hash)';
+
+-- ==========================================
+-- AUDIT LOG
+-- ==========================================
+CREATE TABLE audit_log (
+  id BIGSERIAL PRIMARY KEY,
+  member_id INT REFERENCES members(id),
+  
+  action VARCHAR(100) NOT NULL,
+  resource_type VARCHAR(50),
+  resource_id INT,
+  
+  ip_address INET,
+  user_agent TEXT,
+  
+  details JSONB,
+  
+  timestamp TIMESTAMP NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX idx_audit_member ON audit_log(member_id);
+CREATE INDEX idx_audit_action ON audit_log(action);
+CREATE INDEX idx_audit_timestamp ON audit_log(timestamp DESC);
+CREATE INDEX idx_audit_resource ON audit_log(resource_type, resource_id);
+
+COMMENT ON TABLE audit_log IS 'Comprehensive audit log for all user actions';
diff --git a/schema/05-history.sql b/schema/05-history.sql
new file mode 100644
index 0000000..7d8cdcb
--- /dev/null
+++ b/schema/05-history.sql
@@ -0,0 +1,89 @@
+-- ==========================================
+-- CLUB DAGUERRE CAMERA DATABASE
+-- Part 5: History Tables (Audit Trail)
+-- ==========================================
+
+-- ==========================================
+-- CAMERA MODEL HISTORY
+-- ==========================================
+CREATE TABLE camera_models_history (
+  history_id BIGSERIAL PRIMARY KEY,
+  id INT NOT NULL,
+  manufacturer_id INT,
+  goergens_model_number VARCHAR(10),
+  body_type VARCHAR(2),
+  viewfinder_type VARCHAR(4),
+  format_code VARCHAR(20),
+  year_first INT,
+  year_last INT,
+  
+  -- History metadata
+  version INT NOT NULL,
+  changed_at TIMESTAMP NOT NULL,
+  changed_by INT,
+  change_type VARCHAR(10) NOT NULL,
+  
+  UNIQUE(id, version),
+  CONSTRAINT chk_change_type CHECK (change_type IN ('INSERT', 'UPDATE', 'DELETE'))
+);
+
+CREATE INDEX idx_models_hist_id ON camera_models_history(id);
+CREATE INDEX idx_models_hist_time ON camera_models_history(changed_at DESC);
+
+COMMENT ON TABLE camera_models_history IS 'Historical versions of camera models';
+
+-- ==========================================
+-- LENS/SHUTTER COMBO HISTORY
+-- ==========================================
+CREATE TABLE lens_shutter_combos_history (
+  history_id BIGSERIAL PRIMARY KEY,
+  id INT NOT NULL,
+  housing_variant_id INT,
+  goergens_combo_number VARCHAR(3),
+  lens_id INT,
+  shutter_id INT,
+  weight_g INT,
+  width_mm DECIMAL(6,2),
+  height_mm DECIMAL(6,2),
+  depth_mm DECIMAL(6,2),
+  specs JSONB,
+  
+  version INT NOT NULL,
+  changed_at TIMESTAMP NOT NULL,
+  changed_by INT,
+  change_type VARCHAR(10) NOT NULL,
+  
+  UNIQUE(id, version),
+  CONSTRAINT chk_change_type CHECK (change_type IN ('INSERT', 'UPDATE', 'DELETE'))
+);
+
+CREATE INDEX idx_combos_hist_id ON lens_shutter_combos_history(id);
+CREATE INDEX idx_combos_hist_time ON lens_shutter_combos_history(changed_at DESC);
+
+COMMENT ON TABLE lens_shutter_combos_history IS 'Historical versions of camera combinations';
+
+-- ==========================================
+-- ANNOTATION HISTORY
+-- ==========================================
+CREATE TABLE annotations_history (
+  history_id BIGSERIAL PRIMARY KEY,
+  id INT NOT NULL,
+  combo_id INT,
+  annotation_type VARCHAR(50),
+  content_de TEXT,
+  content_en TEXT,
+  contributed_by INT,
+  
+  version INT NOT NULL,
+  changed_at TIMESTAMP NOT NULL,
+  changed_by INT,
+  change_type VARCHAR(10) NOT NULL,
+  
+  UNIQUE(id, version),
+  CONSTRAINT chk_change_type CHECK (change_type IN ('INSERT', 'UPDATE', 'DELETE'))
+);
+
+CREATE INDEX idx_annotations_hist_id ON annotations_history(id);
+CREATE INDEX idx_annotations_hist_time ON annotations_history(changed_at DESC);
+
+COMMENT ON TABLE annotations_history IS 'Historical versions of user annotations';
diff --git a/schema/06-triggers.sql b/schema/06-triggers.sql
new file mode 100644
index 0000000..8ca7f93
--- /dev/null
+++ b/schema/06-triggers.sql
@@ -0,0 +1,220 @@
+-- ==========================================
+-- CLUB DAGUERRE CAMERA DATABASE
+-- Part 6: Triggers & Functions
+-- ==========================================
+
+-- ==========================================
+-- FUNCTION: Update Denormalized Fields
+-- ==========================================
+CREATE OR REPLACE FUNCTION update_combo_denormalized()
+RETURNS TRIGGER AS $$
+BEGIN
+  -- Get hierarchy IDs
+  SELECT 
+    hv.camera_model_id,
+    cm.manufacturer_id
+  INTO 
+    NEW.camera_model_id,
+    NEW.manufacturer_id
+  FROM housing_variants hv
+  JOIN camera_models cm ON hv.camera_model_id = cm.id
+  WHERE hv.id = NEW.housing_variant_id;
+  
+  -- Generate Goergens ID
+  SELECT 
+    m.goergens_code || ' K ' || cm.goergens_model_number || ' ' || 
+    hv.goergens_variant_letter || NEW.goergens_combo_number
+  INTO NEW.goergens_full_id
+  FROM housing_variants hv
+  JOIN camera_models cm ON hv.camera_model_id = cm.id
+  JOIN manufacturers m ON cm.manufacturer_id = m.id
+  WHERE hv.id = NEW.housing_variant_id;
+  
+  -- Generate display name
+  SELECT 
+    m.name || ' ' || 
+    COALESCE(i18n.model_name, '') ||
+    CASE WHEN hv.color IS NOT NULL THEN ' (' || hv.color || ')' ELSE '' END ||
+    CASE WHEN l.name IS NOT NULL THEN ' ' || l.name ELSE '' END ||
+    CASE WHEN l.focal_length_mm IS NOT NULL THEN ' ' || l.focal_length_mm || 'mm' ELSE '' END ||
+    CASE WHEN s.name IS NOT NULL THEN ' ' || s.name ELSE '' END
+  INTO NEW.display_name
+  FROM housing_variants hv
+  JOIN camera_models cm ON hv.camera_model_id = cm.id
+  JOIN manufacturers m ON cm.manufacturer_id = m.id
+  LEFT JOIN camera_model_i18n i18n ON cm.id = i18n.camera_model_id
+  LEFT JOIN lenses l ON NEW.lens_id = l.id
+  LEFT JOIN shutters s ON NEW.shutter_id = s.id
+  WHERE hv.id = NEW.housing_variant_id;
+  
+  -- Generate search text
+  NEW.search_text := NEW.display_name || ' ' || COALESCE(NEW.goergens_full_id, '');
+  
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+-- Trigger on INSERT
+CREATE TRIGGER trg_combo_denorm_insert
+BEFORE INSERT ON lens_shutter_combos
+FOR EACH ROW
+EXECUTE FUNCTION update_combo_denormalized();
+
+-- Trigger on UPDATE (only when relevant fields change)
+CREATE TRIGGER trg_combo_denorm_update
+BEFORE UPDATE ON lens_shutter_combos
+FOR EACH ROW
+WHEN (
+  OLD.housing_variant_id IS DISTINCT FROM NEW.housing_variant_id OR
+  OLD.lens_id IS DISTINCT FROM NEW.lens_id OR
+  OLD.shutter_id IS DISTINCT FROM NEW.shutter_id
+)
+EXECUTE FUNCTION update_combo_denormalized();
+
+COMMENT ON FUNCTION update_combo_denormalized IS 'Maintains denormalized fields in lens_shutter_combos for query performance';
+
+-- ==========================================
+-- FUNCTION: Version Increment & Timestamp
+-- ==========================================
+CREATE OR REPLACE FUNCTION update_version_and_timestamp()
+RETURNS TRIGGER AS $$
+BEGIN
+  NEW.version := OLD.version + 1;
+  NEW.updated_at := NOW();
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+-- Apply to main tables
+CREATE TRIGGER trg_mfg_version 
+BEFORE UPDATE ON manufacturers
+FOR EACH ROW 
+EXECUTE FUNCTION update_version_and_timestamp();
+
+CREATE TRIGGER trg_models_version 
+BEFORE UPDATE ON camera_models
+FOR EACH ROW 
+EXECUTE FUNCTION update_version_and_timestamp();
+
+CREATE TRIGGER trg_variants_version 
+BEFORE UPDATE ON housing_variants
+FOR EACH ROW 
+EXECUTE FUNCTION update_version_and_timestamp();
+
+CREATE TRIGGER trg_combos_version 
+BEFORE UPDATE ON lens_shutter_combos
+FOR EACH ROW 
+EXECUTE FUNCTION update_version_and_timestamp();
+
+COMMENT ON FUNCTION update_version_and_timestamp IS 'Increments version number and updates timestamp on every change';
+
+-- ==========================================
+-- FUNCTION: Maintain Camera Models History
+-- ==========================================
+CREATE OR REPLACE FUNCTION camera_models_to_history()
+RETURNS TRIGGER AS $$
+BEGIN
+  IF TG_OP = 'UPDATE' THEN
+    INSERT INTO camera_models_history (
+      id, manufacturer_id, goergens_model_number, body_type, 
+      viewfinder_type, format_code, year_first, year_last,
+      version, changed_at, changed_by, change_type
+    )
+    VALUES (
+      OLD.id, OLD.manufacturer_id, OLD.goergens_model_number, OLD.body_type,
+      OLD.viewfinder_type, OLD.format_code, OLD.year_first, OLD.year_last,
+      OLD.version, NOW(), NEW.updated_by, 'UPDATE'
+    );
+  ELSIF TG_OP = 'DELETE' THEN
+    INSERT INTO camera_models_history (
+      id, manufacturer_id, goergens_model_number, body_type,
+      viewfinder_type, format_code, year_first, year_last,
+      version, changed_at, changed_by, change_type
+    )
+    VALUES (
+      OLD.id, OLD.manufacturer_id, OLD.goergens_model_number, OLD.body_type,
+      OLD.viewfinder_type, OLD.format_code, OLD.year_first, OLD.year_last,
+      OLD.version, NOW(), NULL, 'DELETE'
+    );
+  END IF;
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trg_models_history
+AFTER UPDATE OR DELETE ON camera_models
+FOR EACH ROW
+EXECUTE FUNCTION camera_models_to_history();
+
+COMMENT ON FUNCTION camera_models_to_history IS 'Maintains historical versions of camera models';
+
+-- ==========================================
+-- FUNCTION: Maintain Combos History
+-- ==========================================
+CREATE OR REPLACE FUNCTION lens_shutter_combos_to_history()
+RETURNS TRIGGER AS $$
+BEGIN
+  IF TG_OP = 'UPDATE' THEN
+    INSERT INTO lens_shutter_combos_history (
+      id, housing_variant_id, goergens_combo_number, lens_id, shutter_id,
+      weight_g, width_mm, height_mm, depth_mm, specs,
+      version, changed_at, changed_by, change_type
+    )
+    VALUES (
+      OLD.id, OLD.housing_variant_id, OLD.goergens_combo_number, OLD.lens_id, OLD.shutter_id,
+      OLD.weight_g, OLD.width_mm, OLD.height_mm, OLD.depth_mm, OLD.specs,
+      OLD.version, NOW(), NEW.updated_by, 'UPDATE'
+    );
+  ELSIF TG_OP = 'DELETE' THEN
+    INSERT INTO lens_shutter_combos_history (
+      id, housing_variant_id, goergens_combo_number, lens_id, shutter_id,
+      weight_g, width_mm, height_mm, depth_mm, specs,
+      version, changed_at, changed_by, change_type
+    )
+    VALUES (
+      OLD.id, OLD.housing_variant_id, OLD.goergens_combo_number, OLD.lens_id, OLD.shutter_id,
+      OLD.weight_g, OLD.width_mm, OLD.height_mm, OLD.depth_mm, OLD.specs,
+      OLD.version, NOW(), NULL, 'DELETE'
+    );
+  END IF;
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trg_combos_history
+AFTER UPDATE OR DELETE ON lens_shutter_combos
+FOR EACH ROW
+EXECUTE FUNCTION lens_shutter_combos_to_history();
+
+COMMENT ON FUNCTION lens_shutter_combos_to_history IS 'Maintains historical versions of camera combinations';
+
+-- ==========================================
+-- FUNCTION: Validate Goergens ID Structure
+-- ==========================================
+CREATE OR REPLACE FUNCTION validate_goergens_structure()
+RETURNS TABLE(combo_id INT, goergens_id VARCHAR, issue TEXT) AS $$
+BEGIN
+  -- Check model numbers are consistent
+  RETURN QUERY
+  SELECT 
+    lsc.id,
+    lsc.goergens_full_id,
+    'Inconsistent model number in same camera_model'::TEXT AS issue
+  FROM lens_shutter_combos lsc
+  JOIN housing_variants hv ON lsc.housing_variant_id = hv.id
+  JOIN camera_models cm ON hv.camera_model_id = cm.id
+  WHERE split_part(lsc.goergens_full_id, ' ', 3) != cm.goergens_model_number;
+  
+  -- Check variant letters are consistent
+  RETURN QUERY
+  SELECT 
+    lsc.id,
+    lsc.goergens_full_id,
+    'Inconsistent variant letter'::TEXT AS issue
+  FROM lens_shutter_combos lsc
+  JOIN housing_variants hv ON lsc.housing_variant_id = hv.id
+  WHERE substring(split_part(lsc.goergens_full_id, ' ', 4), 1, 1) != hv.goergens_variant_letter;
+END;
+$$ LANGUAGE plpgsql;
+
+COMMENT ON FUNCTION validate_goergens_structure IS 'Validates that Goergens IDs match the hierarchy structure';
diff --git a/schema/07-views.sql b/schema/07-views.sql
new file mode 100644
index 0000000..620e9b3
--- /dev/null
+++ b/schema/07-views.sql
@@ -0,0 +1,305 @@
+-- ==========================================
+-- CLUB DAGUERRE CAMERA DATABASE
+-- Part 7: Materialized Views
+-- ==========================================
+
+-- ==========================================
+-- MV: MANUFACTURER STATISTICS
+-- ==========================================
+CREATE MATERIALIZED VIEW mv_manufacturer_stats AS
+SELECT 
+  m.id AS manufacturer_id,
+  m.name AS manufacturer_name,
+  m.goergens_code,
+  m.country,
+  
+  COUNT(DISTINCT cm.id) AS model_count,
+  COUNT(DISTINCT lsc.id) AS camera_count,
+  
+  MIN(cm.year_first) AS first_camera_year,
+  MAX(cm.year_last) AS last_camera_year,
+  
+  COUNT(DISTINCT CASE WHEN i.rights_status = 'verified' THEN i.id END) AS verified_image_count,
+  COUNT(DISTINCT CASE WHEN d.document_type = 'user_manual' THEN d.id END) AS manual_count,
+  COUNT(DISTINCT CASE WHEN d.document_type = 'repair_manual' THEN d.id END) AS repair_manual_count,
+  COUNT(DISTINCT ca.article_id) AS article_count
+  
+FROM manufacturers m
+LEFT JOIN camera_models cm ON m.id = cm.manufacturer_id AND cm.deleted_at IS NULL
+LEFT JOIN housing_variants hv ON cm.id = hv.camera_model_id AND hv.deleted_at IS NULL
+LEFT JOIN lens_shutter_combos lsc ON hv.id = lsc.housing_variant_id AND lsc.deleted_at IS NULL
+LEFT JOIN images i ON (
+  i.manufacturer_id = m.id OR 
+  i.camera_model_id = cm.id OR 
+  i.housing_variant_id = hv.id OR 
+  i.combo_id = lsc.id
+) AND i.deleted_at IS NULL
+LEFT JOIN documents d ON (
+  d.manufacturer_id = m.id OR
+  d.camera_model_id = cm.id OR
+  d.housing_variant_id = hv.id OR
+  d.combo_id = lsc.id
+) AND d.deleted_at IS NULL
+LEFT JOIN camera_articles ca ON (
+  ca.manufacturer_id = m.id OR
+  ca.camera_model_id = cm.id OR
+  ca.housing_variant_id = hv.id OR
+  ca.combo_id = lsc.id
+)
+
+WHERE m.deleted_at IS NULL
+GROUP BY m.id, m.name, m.goergens_code, m.country;
+
+CREATE UNIQUE INDEX idx_mv_mfg_stats_id ON mv_manufacturer_stats(manufacturer_id);
+CREATE INDEX idx_mv_mfg_stats_name ON mv_manufacturer_stats(manufacturer_name);
+CREATE INDEX idx_mv_mfg_stats_country ON mv_manufacturer_stats(country);
+
+COMMENT ON MATERIALIZED VIEW mv_manufacturer_stats IS 
+'Pre-computed manufacturer statistics. Refresh hourly with: REFRESH MATERIALIZED VIEW CONCURRENTLY mv_manufacturer_stats;';
+
+-- ==========================================
+-- MV: PUBLIC CATALOG (Fast Search Index)
+-- ==========================================
+CREATE MATERIALIZED VIEW mv_public_catalog AS
+SELECT 
+  lsc.id AS combo_id,
+  lsc.goergens_full_id,
+  lsc.display_name,
+  
+  m.id AS manufacturer_id,
+  m.name AS manufacturer_name,
+  m.country,
+  
+  cm.id AS model_id,
+  i18n.model_name,
+  cm.body_type,
+  cm.viewfinder_type,
+  cm.format_code,
+  cm.year_first,
+  cm.year_last,
+  
+  -- Terminology lookups
+  (SELECT term_de FROM terminology WHERE concept_code = 'BODY_TYPE_' || UPPER(cm.body_type)) AS body_type_de,
+  (SELECT term_en FROM terminology WHERE concept_code = 'BODY_TYPE_' || UPPER(cm.body_type)) AS body_type_en,
+  
+  -- Lens info
+  l.name AS lens_name,
+  l.focal_length_mm,
+  l.max_aperture,
+  
+  -- Shutter info
+  s.name AS shutter_name,
+  
+  -- Media flags
+  EXISTS(
+    SELECT 1 FROM images 
+    WHERE (combo_id = lsc.id OR camera_model_id = cm.id OR housing_variant_id = hv.id OR manufacturer_id = m.id)
+      AND rights_status = 'verified' 
+      AND deleted_at IS NULL
+  ) AS has_images,
+  
+  (
+    SELECT filename FROM images
+    WHERE camera_model_id = cm.id 
+      AND rights_status = 'verified' 
+      AND sort_order = 0 
+      AND deleted_at IS NULL
+    LIMIT 1
+  ) AS primary_image_filename,
+  
+  EXISTS(
+    SELECT 1 FROM documents 
+    WHERE (combo_id = lsc.id OR camera_model_id = cm.id)
+      AND document_type = 'user_manual' 
+      AND deleted_at IS NULL
+  ) AS has_manual,
+  
+  EXISTS(
+    SELECT 1 FROM documents 
+    WHERE (combo_id = lsc.id OR camera_model_id = cm.id)
+      AND document_type = 'repair_manual' 
+      AND deleted_at IS NULL
+  ) AS has_repair_manual,
+  
+  (
+    SELECT COUNT(*) FROM camera_articles 
+    WHERE combo_id = lsc.id OR camera_model_id = cm.id
+  ) AS article_count,
+  
+  -- Search text
+  m.name || ' ' || 
+  COALESCE(i18n.model_name, '') || ' ' || 
+  COALESCE(i18n.description_de, '') || ' ' ||
+  cm.format_code || ' ' ||
+  COALESCE(l.name, '') || ' ' ||
+  COALESCE(s.name, '') AS search_text
+  
+FROM lens_shutter_combos lsc
+JOIN housing_variants hv ON lsc.housing_variant_id = hv.id
+JOIN camera_models cm ON hv.camera_model_id = cm.id
+JOIN manufacturers m ON cm.manufacturer_id = m.id
+LEFT JOIN camera_model_i18n i18n ON cm.id = i18n.camera_model_id
+LEFT JOIN lenses l ON lsc.lens_id = l.id
+LEFT JOIN shutters s ON lsc.shutter_id = s.id
+
+WHERE lsc.deleted_at IS NULL
+  AND hv.deleted_at IS NULL
+  AND cm.deleted_at IS NULL
+  AND m.deleted_at IS NULL;
+
+CREATE UNIQUE INDEX idx_mv_catalog_id ON mv_public_catalog(combo_id);
+CREATE INDEX idx_mv_catalog_mfg ON mv_public_catalog(manufacturer_name);
+CREATE INDEX idx_mv_catalog_years ON mv_public_catalog(year_first, year_last);
+CREATE INDEX idx_mv_catalog_body ON mv_public_catalog(body_type);
+CREATE INDEX idx_mv_catalog_format ON mv_public_catalog(format_code);
+CREATE INDEX idx_mv_catalog_fts ON mv_public_catalog USING GIN(to_tsvector('german', search_text));
+
+COMMENT ON MATERIALIZED VIEW mv_public_catalog IS 
+'Pre-joined catalog for fast public search. Refresh every 15-30 minutes.';
+
+-- ==========================================
+-- MV: DASHBOARD STATISTICS
+-- ==========================================
+CREATE MATERIALIZED VIEW mv_dashboard_stats AS
+SELECT 
+  'total_cameras' AS metric,
+  COUNT(*)::TEXT AS value,
+  NOW() AS calculated_at
+FROM lens_shutter_combos WHERE deleted_at IS NULL
+
+UNION ALL
+
+SELECT 'total_manufacturers', COUNT(*)::TEXT, NOW()
+FROM manufacturers WHERE deleted_at IS NULL
+
+UNION ALL
+
+SELECT 'total_models', COUNT(*)::TEXT, NOW()
+FROM camera_models WHERE deleted_at IS NULL
+
+UNION ALL
+
+SELECT 'cameras_with_images', COUNT(DISTINCT combo_id)::TEXT, NOW()
+FROM images WHERE rights_status = 'verified' AND deleted_at IS NULL
+
+UNION ALL
+
+SELECT 'cameras_need_images', 
+  (SELECT COUNT(*) FROM lens_shutter_combos lsc
+   WHERE deleted_at IS NULL
+     AND NOT EXISTS(
+       SELECT 1 FROM images 
+       WHERE (combo_id = lsc.id OR camera_model_id = lsc.camera_model_id) 
+         AND deleted_at IS NULL
+     ))::TEXT, 
+  NOW()
+
+UNION ALL
+
+SELECT 'uncertain_images', COUNT(*)::TEXT, NOW()
+FROM images WHERE rights_status = 'uncertain' AND deleted_at IS NULL
+
+UNION ALL
+
+SELECT 'total_articles', COUNT(*)::TEXT, NOW()
+FROM articles WHERE deleted_at IS NULL
+
+UNION ALL
+
+SELECT 'total_documents', COUNT(*)::TEXT, NOW()
+FROM documents WHERE deleted_at IS NULL
+
+UNION ALL
+
+SELECT 'user_manuals', COUNT(*)::TEXT, NOW()
+FROM documents WHERE document_type = 'user_manual' AND deleted_at IS NULL
+
+UNION ALL
+
+SELECT 'repair_manuals', COUNT(*)::TEXT, NOW()
+FROM documents WHERE document_type = 'repair_manual' AND deleted_at IS NULL
+
+UNION ALL
+
+SELECT 'newest_camera_year', MAX(year_last)::TEXT, NOW()
+FROM camera_models WHERE deleted_at IS NULL
+
+UNION ALL
+
+SELECT 'oldest_camera_year', MIN(year_first)::TEXT, NOW()
+FROM camera_models WHERE deleted_at IS NULL AND year_first IS NOT NULL;
+
+CREATE INDEX idx_mv_dashboard_metric ON mv_dashboard_stats(metric);
+
+COMMENT ON MATERIALIZED VIEW mv_dashboard_stats IS 
+'Admin dashboard metrics. Refresh every 5 minutes.';
+
+-- ==========================================
+-- CONVENIENCE VIEW: Complete Camera Info
+-- ==========================================
+CREATE VIEW v_cameras_complete AS
+SELECT 
+  lsc.id AS combo_id,
+  lsc.goergens_full_id,
+  lsc.display_name,
+  
+  -- Manufacturer
+  m.id AS manufacturer_id,
+  m.name AS manufacturer_name,
+  m.goergens_code AS manufacturer_code,
+  m.country,
+  
+  -- Model
+  cm.id AS model_id,
+  i18n.model_name,
+  cm.body_type,
+  cm.viewfinder_type,
+  cm.format_code,
+  cm.year_first,
+  cm.year_last,
+  i18n.description_de,
+  i18n.description_en,
+  
+  -- Variant
+  hv.id AS variant_id,
+  hv.goergens_variant_letter,
+  hv.color,
+  hv.body_material,
+  
+  -- Combo specifics
+  lsc.goergens_combo_number,
+  
+  -- Lens
+  l.id AS lens_id,
+  l.name AS lens_name,
+  l.focal_length_mm,
+  l.max_aperture,
+  
+  -- Shutter
+  s.id AS shutter_id,
+  s.name AS shutter_name,
+  s.shutter_type,
+  
+  -- Technical
+  lsc.weight_g,
+  lsc.width_mm,
+  lsc.height_mm,
+  lsc.depth_mm,
+  lsc.specs,
+  
+  -- Audit
+  lsc.created_at,
+  lsc.updated_at,
+  lsc.version
+
+FROM lens_shutter_combos lsc
+JOIN housing_variants hv ON lsc.housing_variant_id = hv.id
+JOIN camera_models cm ON hv.camera_model_id = cm.id
+JOIN manufacturers m ON cm.manufacturer_id = m.id
+LEFT JOIN camera_model_i18n i18n ON cm.id = i18n.camera_model_id
+LEFT JOIN lenses l ON lsc.lens_id = l.id
+LEFT JOIN shutters s ON lsc.shutter_id = s.id
+
+WHERE lsc.deleted_at IS NULL;
+
+COMMENT ON VIEW v_cameras_complete IS 'Complete camera information with all hierarchy levels joined';
diff --git a/schema/08-seed-data.sql b/schema/08-seed-data.sql
new file mode 100644
index 0000000..56fe6a8
--- /dev/null
+++ b/schema/08-seed-data.sql
@@ -0,0 +1,159 @@
+-- ==========================================
+-- CLUB DAGUERRE CAMERA DATABASE
+-- Part 8: Seed Data
+-- ==========================================
+
+-- ==========================================
+-- CONTENT SOURCES
+-- ==========================================
+INSERT INTO content_sources (source_name, source_type, rights_status, legal_notes, verified_by, verified_date) VALUES
+('Club Daguerre - Photo Antiquaria', 'internal', 'owned', 'Club owns publication and digitization rights', 'Walter Jekat', CURRENT_DATE),
+('Club Daguerre aktuell', 'internal', 'owned', 'Club publication, full rights', 'Walter Jekat', CURRENT_DATE),
+('Harald Goergens Collection', 'licensed', 'owned', 'Harald grants perpetual license for his photos/data to Club Daguerre', 'Walter Jekat', CURRENT_DATE),
+('Steimer Database - Images', 'uncertain', 'questionable', 'Source unknown. DO NOT publish without clearance. Internal research only.', NULL, NULL),
+('Steimer Database - Text', 'uncertain', 'questionable', 'Text from various publications. Rights status unknown. Use metadata only.', NULL, NULL),
+('User Contributed', 'licensed', 'licensed', 'Users grant CC-BY-SA license on upload', 'System', CURRENT_DATE),
+('Pre-1923 Public Domain', 'public_domain', 'public_domain', 'Works published before 1923 are public domain', 'Walter Jekat', CURRENT_DATE),
+('Manufacturer Marketing', 'public_domain', 'fair_use', 'Brochures, ads, price lists - marketing materials (fair use)', 'Walter Jekat', CURRENT_DATE);
+
+-- ==========================================
+-- CORE TERMINOLOGY CONCEPTS
+-- ==========================================
+
+-- Body Types
+INSERT INTO concepts (concept_code, category, sort_order) VALUES
+('BODY_TYPE_LB', 'body_type', 1),
+('BODY_TYPE_FG', 'body_type', 2),
+('BODY_TYPE_KL', 'body_type', 3),
+('BODY_TYPE_SP', 'body_type', 4),
+('BODY_TYPE_RK', 'body_type', 5),
+('BODY_TYPE_BO', 'body_type', 6),
+('BODY_TYPE_TU', 'body_type', 7),
+('BODY_TYPE_MG', 'body_type', 8);
+
+-- Body Type Terms
+INSERT INTO concept_terms (concept_id, language_code, term, term_type) VALUES
+-- Laufboden (Lb)
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_LB'), 'de', 'Laufbodenkamera', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_LB'), 'de', 'Lb', 'abbreviation'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_LB'), 'de', 'Laufboden', 'synonym'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_LB'), 'en', 'Strut folder camera', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_LB'), 'en', 'SF', 'abbreviation'),
+
+-- Festgehäuse (Fg)
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_FG'), 'de', 'Festgehäuse', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_FG'), 'de', 'Fg', 'abbreviation'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_FG'), 'en', 'Rigid body camera', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_FG'), 'en', 'Rigid', 'synonym'),
+
+-- Klappkamera (Kl)
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_KL'), 'de', 'Klappkamera', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_KL'), 'de', 'Kl', 'abbreviation'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_KL'), 'en', 'Folding camera', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_KL'), 'en', 'Folder', 'synonym'),
+
+-- Spiegelreflex (Sp)
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_SP'), 'de', 'Spiegelreflexkamera', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_SP'), 'de', 'Sp', 'abbreviation'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_SP'), 'de', 'Spiegelreflex', 'synonym'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_SP'), 'en', 'Single-lens reflex', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_SP'), 'en', 'SLR', 'abbreviation'),
+
+-- Reflexkamera (Rk)
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_RK'), 'de', 'Reflexkamera', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_RK'), 'de', 'Rk', 'abbreviation'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_RK'), 'en', 'Twin-lens reflex', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_RK'), 'en', 'TLR', 'abbreviation'),
+
+-- Boxkamera (Bo)
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_BO'), 'de', 'Boxkamera', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_BO'), 'de', 'Bo', 'abbreviation'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_BO'), 'de', 'Box', 'synonym'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_BO'), 'en', 'Box camera', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_BO'), 'en', 'Box', 'abbreviation'),
+
+-- Tubus (Tu)
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_TU'), 'de', 'Tubuskamera', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_TU'), 'de', 'Tu', 'abbreviation'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_TU'), 'en', 'Tube camera', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_TU'), 'en', 'Tube', 'abbreviation'),
+
+-- Magazine (Mg)
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_MG'), 'de', 'Magazinkamera', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_MG'), 'de', 'Mg', 'abbreviation'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_MG'), 'en', 'Magazine camera', 'primary'),
+((SELECT id FROM concepts WHERE concept_code = 'BODY_TYPE_MG'), 'en', 'Mag', 'abbreviation');
+
+-- ==========================================
+-- COMMON FILM FORMATS
+-- ==========================================
+INSERT INTO formats (format_code, width_mm, height_mm, format_type, description_de, description_en, sort_order) VALUES
+('9x12 Pl', 90, 120, 'plate', 'Glasplatte 9×12 cm', 'Glass plate 9×12 cm', 10),
+('13x18 Pl', 130, 180, 'plate', 'Glasplatte 13×18 cm', 'Glass plate 13×18 cm', 20),
+('6x9 RF', 60, 90, 'rollfilm', 'Rollfilm 6×9 cm', 'Rollfilm 6×9 cm', 30),
+('6x6 RF', 60, 60, 'rollfilm', 'Rollfilm 6×6 cm', 'Rollfilm 6×6 cm', 40),
+('24x36 KB', 24, 36, '35mm', 'Kleinbild 24×36 mm', '35mm film', 50);
+
+-- ==========================================
+-- SAMPLE LENSES
+-- ==========================================
+INSERT INTO lenses (name, manufacturer, focal_length_mm, max_aperture, lens_type, notes) VALUES
+('Tessar', 'Zeiss', 50, 3.5, 'prime', 'Classic 4-element lens'),
+('Tessar', 'Zeiss', 105, 4.5, 'prime', 'Medium telephoto version'),
+('Xenar', 'Schneider', 50, 2.8, 'prime', 'High-speed Tessar type'),
+('Anastigmat', 'Various', NULL, NULL, 'prime', 'Generic designation for corrected lenses');
+
+-- ==========================================
+-- SAMPLE SHUTTERS
+-- ==========================================
+INSERT INTO shutters (name, manufacturer, shutter_type, speed_range, notes) VALUES
+('Compur', 'Deckel', 'leaf', '1-1/300s, B', 'Most common leaf shutter'),
+('Prontor', 'Gauthier', 'leaf', '1-1/300s, B', 'Alternative to Compur'),
+('Ibsor', 'Deckel', 'leaf', '1-1/100s, B', 'Budget version of Compur');
+
+-- ==========================================
+-- SYSTEM CONFIGURATION
+-- ==========================================
+INSERT INTO system_config (key, value, description, updated_by, updated_at) VALUES
+('schema_version', '1.0', 'Current database schema version', 'Installation', NOW()),
+('last_import', NULL, 'Timestamp of last Goergens data import', NULL, NULL),
+('research_password_changed', NULL, 'Date of last research password change', NULL, NULL);
+
+-- ==========================================
+-- ANALYSIS REPORT
+-- ==========================================
+DO $$
+DECLARE
+  table_count INT;
+  index_count INT;
+  view_count INT;
+  function_count INT;
+BEGIN
+  SELECT COUNT(*) INTO table_count 
+  FROM information_schema.tables 
+  WHERE table_schema = 'public' AND table_type = 'BASE TABLE';
+  
+  SELECT COUNT(*) INTO index_count 
+  FROM pg_indexes 
+  WHERE schemaname = 'public';
+  
+  SELECT COUNT(*) INTO view_count 
+  FROM information_schema.views 
+  WHERE table_schema = 'public';
+  
+  SELECT COUNT(*) INTO function_count 
+  FROM pg_proc 
+  WHERE pronamespace = 'public'::regnamespace;
+  
+  RAISE NOTICE '===========================================';
+  RAISE NOTICE 'CLUB DAGUERRE CAMERA DATABASE';
+  RAISE NOTICE 'Schema Installation Complete';
+  RAISE NOTICE '===========================================';
+  RAISE NOTICE 'Tables created: %', table_count;
+  RAISE NOTICE 'Indexes created: %', index_count;
+  RAISE NOTICE 'Views created: %', view_count;
+  RAISE NOTICE 'Functions created: %', function_count;
+  RAISE NOTICE '===========================================';
+  RAISE NOTICE 'Ready for Goergens data import';
+  RAISE NOTICE '===========================================';
+END $$;
diff --git a/schema/README-SCHEMA.md b/schema/README-SCHEMA.md
new file mode 100644
index 0000000..b158899
--- /dev/null
+++ b/schema/README-SCHEMA.md
@@ -0,0 +1,190 @@
+# Club Daguerre Camera Database - Schema Installation
+
+## Overview
+
+Complete PostgreSQL 16 schema for the Club Daguerre camera database, preserving Harald Goergens' 30+ year classification work with modern metadata management.
+
+## Prerequisites
+
+- PostgreSQL 16 installed
+- camera_db database created
+- Port 5433 (or your configured port)
+
+## Installation Order
+
+The schema is split into logical sections for clarity and maintainability:
+
+1. **01-core-hierarchy.sql** - Manufacturers, models, variants, combos
+2. **02-supporting.sql** - Lenses, shutters, formats, terminology
+3. **03-content.sql** - Images, documents, articles (multi-level linking)
+4. **04-auth.sql** - Members, research access, audit log
+5. **05-history.sql** - History tables for audit trail
+6. **06-triggers.sql** - Triggers and functions for automation
+7. **07-views.sql** - Materialized views for performance
+8. **08-seed-data.sql** - Initial data (sources, terminology, samples)
+
+## Quick Installation
+
+### Method 1: All at Once
+
+```bash
+cd /data/camera-database/schema
+
+# Run all files in order
+for file in 0{1..8}-*.sql; do
+  echo "Installing $file..."
+  psql -h localhost -p 5433 -U postgres -d camera_db -f "$file"
+done
+```
+
+### Method 2: One by One
+
+```bash
+cd /data/camera-database/schema
+
+psql -h localhost -p 5433 -U postgres -d camera_db -f 01-core-hierarchy.sql
+psql -h localhost -p 5433 -U postgres -d camera_db -f 02-supporting.sql
+psql -h localhost -p 5433 -U postgres -d camera_db -f 03-content.sql
+psql -h localhost -p 5433 -U postgres -d camera_db -f 04-auth.sql
+psql -h localhost -p 5433 -U postgres -d camera_db -f 05-history.sql
+psql -h localhost -p 5433 -U postgres -d camera_db -f 06-triggers.sql
+psql -h localhost -p 5433 -U postgres -d camera_db -f 07-views.sql
+psql -h localhost -p 5433 -U postgres -d camera_db -f 08-seed-data.sql
+```
+
+## Verification
+
+After installation:
+
+```sql
+-- Connect to database
+psql -h localhost -p 5433 -U postgres -d camera_db
+
+-- Check tables
+\dt
+
+-- Check views
+\dv
+
+-- Check materialized views
+\dm
+
+-- Check functions
+\df
+
+-- Run validation
+SELECT * FROM validate_goergens_structure();
+
+-- Check seed data
+SELECT * FROM content_sources;
+SELECT * FROM terminology LIMIT 10;
+
+-- Exit
+\q
+```
+
+## Schema Statistics
+
+Expected after installation:
+- **Tables:** 35
+- **Indexes:** ~80
+- **Views:** 2
+- **Materialized Views:** 3
+- **Functions:** 5
+- **Triggers:** 8
+
+## Key Features
+
+### 1. Goergens Hierarchy Preservation
+- Manufacturers (ERNM, ZEII, etc.)
+- Models (1910, 0450, etc.)
+- Variants (a, b, c - color/material)
+- Combos (01, 02 - lens/shutter configs)
+
+### 2. Multi-Level Content Linking
+Images, documents, and articles can link at ANY level:
+- Manufacturer level (company history)
+- Model level (camera manual - shared by all variants)
+- Variant level (color-specific photo)
+- Combo level (lens manual - combo-specific)
+
+### 3. Rights Management
+- **verified:** Publishable content
+- **uncertain:** Research-only (Steimer data)
+- **restricted:** Internal only
+
+### 4. Performance Optimizations
+- Denormalized fields in lens_shutter_combos
+- Materialized views for dashboard/search
+- GIN indexes for full-text search
+- GIST indexes for range queries
+
+### 5. Audit Trail
+- Version numbers on all records
+- History tables track all changes
+- Comprehensive audit log
+- Timestamp tracking
+
+### 6. Multilingual Support
+- German/English core (expandable)
+- Separate i18n tables for content
+- Language-agnostic codes
+
+## Maintenance
+
+### Refresh Materialized Views
+
+```sql
+-- Hourly (manufacturer stats)
+REFRESH MATERIALIZED VIEW CONCURRENTLY mv_manufacturer_stats;
+
+-- Every 15-30 minutes (search catalog)
+REFRESH MATERIALIZED VIEW CONCURRENTLY mv_public_catalog;
+
+-- Every 5 minutes (dashboard)
+REFRESH MATERIALIZED VIEW CONCURRENTLY mv_dashboard_stats;
+```
+
+### Backup
+
+```bash
+# Full backup
+pg_dump -h localhost -p 5433 -U postgres camera_db | gzip > /mnt/data/postgresql/backups/camera_db_$(date +%Y%m%d).sql.gz
+
+# Schema only
+pg_dump -h localhost -p 5433 -U postgres -s camera_db > /mnt/data/postgresql/backups/camera_db_schema.sql
+```
+
+## Next Steps
+
+1. ✅ Schema installed
+2. Import Goergens data (74,000+ cameras)
+3. Import Photo Antiquaria articles
+4. Add images and documents
+5. Develop Flask web application
+
+## Troubleshooting
+
+### "relation already exists"
+Schema already partially installed. Either:
+- Drop database and recreate: `DROP DATABASE camera_db; CREATE DATABASE camera_db;`
+- Or skip to the file where installation failed
+
+### Foreign key violations
+Files must be run in order (01 through 08). Foreign keys depend on tables from earlier files.
+
+### Permission denied
+Use postgres superuser: `-U postgres`
+
+## Documentation
+
+- **Design Document:** /data/camera-database/docs/database-design.md
+- **PostgreSQL Setup:** /data/camera-database/docs/postgresql-setup.md
+- **Goergens Email:** /data/camera-database/docs/goergens-email.txt
+
+## Version
+
+- Schema Version: 1.0
+- PostgreSQL: 16+
+- Date: November 2025
+- Author: Walter Jekat / Club Daguerre e.V.