all these changes

database/migrations/V16__add_nozzle_fields_to_user_equipment.sql

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+-- Align user_equipment with the nozzle-aware equipment routes.
+
+ALTER TABLE user_equipment
+ADD COLUMN IF NOT EXISTS orifice_size VARCHAR(20),
+ADD COLUMN IF NOT EXISTS spray_angle INTEGER,
+ADD COLUMN IF NOT EXISTS flow_rate_gpm DECIMAL(6, 3),
+ADD COLUMN IF NOT EXISTS droplet_size VARCHAR(50),
+ADD COLUMN IF NOT EXISTS spray_pattern VARCHAR(50),
+ADD COLUMN IF NOT EXISTS pressure_range_psi VARCHAR(50),
+ADD COLUMN IF NOT EXISTS thread_size VARCHAR(20),
+ADD COLUMN IF NOT EXISTS material VARCHAR(50),
+ADD COLUMN IF NOT EXISTS color_code VARCHAR(50),
+ADD COLUMN IF NOT EXISTS quantity_owned INTEGER DEFAULT 1;
+
+CREATE INDEX IF NOT EXISTS idx_user_equipment_nozzle_specs
+  ON user_equipment(orifice_size, droplet_size, spray_angle)
+  WHERE orifice_size IS NOT NULL;