-- ==========================================
-- 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';