feat(ai): refine extraction prompt with human-readable size conversions

- Add SIZE CONVERSION RULES section (critical) with explicit thresholds
- Convert ≥1600GB to TB format (e.g., 1600GB → 1.6TB)
- Convert memory ≥1024MB to GB format
- Update Item field examples with human-readable sizes
- Update Size field definition to emphasize HUMAN-READABLE format
- Update OCR key definition with size conversion examples
- Apply rules consistently across all size-related fields

This ensures AI-extracted items display sizes in user-friendly format
and improves OCR matching accuracy with normalized size representations.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

backend/main.py

@@ -105,25 +105,32 @@ def startup_event():
         default_prompt = (
             "Extract hardware specifications with PRECISE formatting.\n"
             "For any field, do not add comments in parenthesis or measurement units in Item name.\n\n"
+            "SIZE CONVERSION RULES (CRITICAL - Apply to all size fields):\n"
+            "  Convert sizes to HUMAN-READABLE format:\n"
+            "  • Storage ≥1600GB: convert to TB (e.g., '1600GB' → '1.6TB', '2048GB' → '2TB', '8192GB' → '8TB')\n"
+            "  • Storage 512GB-1599GB: keep as GB (e.g., '512GB', '1TB' if labeled as 1000GB)\n"
+            "  • Memory ≥1024MB: convert to GB (e.g., '1024MB' → '1GB')\n"
+            "  • Cables/length: express in meters (e.g., '5m', '30m')\n"
+            "  Apply this rule to: Item field size prefix, Size field, and OCR key sizes.\n\n"
             "ITEM FIELD FORMAT (Critical):\n"
             "[<size_or_length>] <type> <vendor> <connector> <part_number>\n"
-            "  <size_or_length>: GB/TB for storage, meters for cables (e.g., '2m', '256GB', '2TB'). Omit diameter/mm measurements.\n"
+            "  <size_or_length>: HUMAN-READABLE format - GB/TB for storage, meters for cables (e.g., '2m', '256GB', '1.6TB'). Omit diameter/mm measurements.\n"
             "  <type>: DDR3/DDR4/DDR5/SSD/HDD/NVMe/SAS/SATA/Patchcord/Fiber/Cable/Transceiver etc.\n"
             "  <vendor>: HP/HPE/Dell/Samsung/Cisco/Lenovo/Hynix etc.\n"
             "  <connector>: RJ45/LC-LC/MPO/U.3/SATA/SAS/LC/ST etc. Omit if N/A.\n"
             "  <part_number>: PN only if visible on label. Omit serial numbers.\n"
-            "Examples: '5m Patchcord LC-LC' / '256GB SSD Samsung SAS' / '128GB DDR4 Hynix SK-234' / '2TB NVMe HP U.3'\n\n"
+            "Examples: '5m Patchcord LC-LC' / '256GB SSD Samsung SAS' / '128GB DDR4 Hynix SK-234' / '1.6TB NVMe HP U.3' / '8TB HDD Seagate SATA'\n\n"
             "TYPE: Item asset class (DDR3/SSD/NVMe/Patchcord/SFP etc.)\n"
             "DESCRIPTION: Technical details max 5 words (e.g., 'High speed fiber optic cable'). Omit size/length here.\n"
             "CATEGORY: Broad ecosystem (Memory, Storage, Network, Cabling, etc.)\n"
             "CONNECTOR: Physical interface type (e.g., 'LC', 'RJ45', 'U.3')\n"
-            "SIZE: Capacity or length ONLY (e.g., '256GB', '2m')\n"
+            "SIZE: HUMAN-READABLE capacity or length ONLY (e.g., '256GB', '1.6TB', '2m'). No serial numbers or comments.\n"
             "COLOR: Physical color if distinguishing.\n"
             "PartNr: Part number only (no serial numbers)\n"
-            "OCR: Robust matching key. Include: core type + vendor + key identifiers + common variations.\n"
-            "     Example for '5m Patchcord LC-LC': 'PATCHCORD 5M LC LC CAT6 FIBER'\n"
+            "OCR: Robust matching key. Include: core type + vendor + key identifiers + HUMAN-READABLE size + common variations.\n"
+            "     Examples: 'PATCHCORD 5M LC LC CAT6 FIBER' / '256GB SSD SAMSUNG' / '1.6TB NVME HP' / '128GB DDR4 HYNIX'\n"
             "     Include abbreviations: 'DDR4'/'DDR' or 'SSD'/'SSDS' or 'HP'/'HPE' or 'NVMe'/'NVME'\n"
-            "     Format: ALL UPPERCASE, space-separated tokens, NO special chars. Skip serial numbers."
+            "     Format: ALL UPPERCASE, space-separated tokens, NO special chars. Skip serial numbers. Use human-readable sizes."
         )
         
         # Wrap in JSON instructions for reliable parsing

config/ai_prompt.md

@@ -1,37 +1,98 @@
-# Technical Inventory Multi-Label Extraction Protocol
+  # Technical Inventory Hardware Extraction Protocol
 
-Your goal is to extract precise hardware specifications for ALL relevant inventory items found in the image.
+  Extract ALL relevant hardware items from the image with precise, standardized formatting.
 
-## Intelligence Rules:
-1. **Filtering Strategy**: 
-   - **INCLUDE**: Standalone physical hardware, modules, cables, servers, and storage units.
-   - **EXCLUDE**: Generic mounting hardware (screws, nails, rails, brackets), paper licenses/documentation, or empty packaging, UNLESS they are the primary and only subject of the image.
-   - In cases like image labels listing multiple SKUs (e.g., 5m cable and 7m cable), TREAT EACH LINE AS A SEPARATE ITEM.
+  ## Filtering Rules
+  - **INCLUDE**: Physical hardware, modules, cables, servers, storage, transceivers
+  - **EXCLUDE**: Generic mounting hardware (screws, brackets, rails), paper licenses, empty packaging
+  - **Multi-item labels**: Treat each SKU/variant as a separate item (e.g., "5m cable" and "7m cable" = 2 items)
 
-2. **Field Definitions**:
-   - **Item**: Primary identity (Manufacturer + Core Class). Max 3 words (e.g., "Cisco SFP Module").
-   - **Type**: Asset classification (e.g., "SFP", "patch cords", "NVMe").
-   - **Description**: Technical summary emphasizing speed/capacity. Max 5 words.
-   - **Category**: Broad ecosystem (e.g., "Network", "Storage").
-   - **Connector**: Physical interface (e.g., "LC/UPC", "RJ45").
-   - **Size**: Capacity or Length (e.g., "1.6TB", "5m").
-   - **Color**: Physical distinguish color.
-   - **PartNr**: Absolute technical identifier (P/N, SKU). Omit Serial Numbers.
-   - **OCR**: Concise technical string for local heuristic matching. **EXCLUDE ALL SERIAL NUMBERS.**
+  ## Item Field Format (CRITICAL)
+  []
 
-## Output Format:
-Return ONLY a valid JSON object with the key "items" containing an array of objects.
-Example:
-{
+  **Component Rules:**
+  - `<size_or_length>`:
+    - **STORAGE CAPACITY - HUMAN READABLE**: Convert to largest unit (TB/MB).
+      - Examples: "1600GB" → "1.6TB", "256GB" → "256GB", "512MB" → "512MB"
+      - Rule: If ≥1000GB, use TB. If ≥1000MB, use GB. Otherwise use MB.
+    - **CABLE/WIRE LENGTH**: Meters only. Examples: "5m", "10m", "50m"
+    - **RAM DIMM**: Capacity in GB. Examples: "128GB", "32GB", "8GB"
+
+  - `<type>`: Asset class. One of: DDR3/DDR4/DDR5, SSD/HDD/NVMe, SATA/SAS, Patchcord/Fiber/Cable, SFP/Transceiver, DIMM, etc.
+  - `<vendor>`: Manufacturer (HP, HPE, Dell, Samsung, Cisco, Hynix, Intel, Broadcom)
+  - `<connector>`: Physical interface (RJ45, LC-LC, MPO, U.3, SATA, SAS, ST, SC). Omit if N/A.
+  - `<part_number>`: Part number ONLY if visible. **Omit serial numbers.**
+
+  **Item Examples (WITH HUMAN-READABLE SIZES):**
+  - `1.6TB NVMe HPE U.3 P66093-002` (not 1600GB)
+  - `256GB SSD Dell SATA SK-8765` (already human-readable)
+  - `5m Patchcord LC-LC`
+  - `128GB DDR4 Hynix`
+  - `512MB Cache Samsung SATA` (stays MB if under 1GB)
+
+  **Size Conversion Examples:**
+  - 1600GB → 1.6TB
+  - 2048GB → 2TB
+  - 512GB → 512GB (under 1TB threshold)
+  - 256MB → 256MB
+  - 1024MB → 1GB
+
+  **Restrictions:**
+  - No comments in parenthesis
+  - No measurement units in Item field (e.g., "1.6TB" not "1.6TB Storage")
+  - No secondary vendors
+  - No diameter/mm in Item field
+  - ONE vendor only (primary manufacturer)
+
+  ## Other Fields
+  - **Type**: Repeat the asset class (DDR4, SSD, NVMe, Patchcord, etc.)
+  - **Description**: Technical summary, max 5 words. Examples: "High-speed fiber optic", "Enterprise Gen4 storage"
+  - **Category**: Memory, Storage, Network, Cabling, Compute, Optical, Transceiver
+  - **Connector**: Interface type from Item field. Examples: "LC-LC", "RJ45", "U.3"
+  - **Size**: **HUMAN-READABLE capacity or length.** Examples: "1.6TB", "256GB", "5m" (NOT "1600GB")
+  - **Color**: Physical color if distinguishing
+  - **PartNr**: Part number only (no serial numbers)
+  - **OCR**: Robust matching key for OCR tolerance
+
+  ## OCR Field Rules (CRITICAL)
+  Generate a SHORT, clean matching key:
+  - Format: **UPPERCASE space-separated, NO special chars, NO duplicates**
+  - Include ONLY: Type + Size + Primary Vendor + Connector + Part Number
+  - **EXCLUDE**: Serial numbers, secondary vendors, duplicate tokens, EMC/SK labels
+  - **USE HUMAN-READABLE SIZE**: Use TB/GB from Item field, not original notation
+
+  **OCR Format:** `TYPE SIZE VENDOR CONNECTOR PARTNUMBER`
+
+  **OCR Examples (WITH HUMAN-READABLE SIZES):**
+  - Item: `1.6TB NVMe HPE U.3 P66093-002` → OCR: `NVME 1.6TB HPE U3 P66093002`
+  - Item: `5m Patchcord LC-LC` → OCR: `PATCHCORD 5M LC LC`
+  - Item: `256GB SSD Samsung SAS SK-8765` → OCR: `SSD 256GB SAMSUNG SAS SK8765`
+  - Item: `128GB DDR4 Hynix` → OCR: `DDR4 128GB HYNIX`
+
+  **OCR Constraints:**
+  - NO duplicate part numbers
+  - NO secondary vendor names
+  - NO extraneous labels
+  - Each token appears ONE time only
+  - Remove hyphens/special chars for fuzzy matching
+  - Use HUMAN-READABLE sizes (1.6TB not 1600GB)
+
+  ## Output Format
+  ```json
+  {
     "items": [
       {
-      "Item": "SFP Module",
-      "Type": "SFP",
-      "Description": "64G Gen7 Fibre Channel",
-      "Category": "Network",
-      "Connector": "LC",
-      "PartNr": "SFP-64G-G7",
-      "OCR": "SFP 64G GEN7 FC"
+        "Item": "[size] type vendor connector partnumber",
+        "Type": "type",
+        "Description": "technical details (max 5 words)",
+        "Category": "category",
+        "Connector": "connector_type",
+        "Size": "human_readable_size",
+        "Color": "color",
+        "PartNr": "part_number",
+        "OCR": "TYPE SIZE VENDOR CONNECTOR PARTNUMBER"
       }
     ]
-}
+  }
+
+  Return ONLY JSON. No markdown. No text.