What data looks like for this category
Packaging and printing investment research data comes primarily from monthly production capacity statistics from industry associations, daily price ledgers from upstream raw and auxiliary material suppliers, custom order scheduling sheets from downstream brand owners, and operation logs and quality inspection reports from printing equipment. Data update cycles vary significantly. Raw and auxiliary material prices are updated daily. Order schedules adjust in real time based on customer demand. Industry production capacity reports are released quarterly.
Document structure includes structured fields and unstructured text. Structured fields cover material codes, paper grammage, number of printing colors, single-batch production capacity (tons), unit price (yuan per square meter), delivery cycle (days), and more. Unstructured text mostly consists of long documents such as process specifications and compliance inspection reports.
What constraints these characteristics impose on database and operations workflows
Data from multiple sources with varying update cycles requires the database to support both structured storage and unstructured vector retrieval, to avoid data silos. Data sources with different update frequencies need matching scheduled update tasks, to prevent high-frequency tasks from consuming excessive operation and maintenance resources.
Fields include specific units and precise codes. Format verification must be completed during data ingestion to prevent invalid data from entering the knowledge base. Long-text process reports and short-entry quotation sheets coexist. Adaptive segmentation and indexing strategies are required to balance retrieval accuracy and storage efficiency.
Configuration settings
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
UPLOAD_FILE_MAX_SIZE | 1000 MB | Single files such as packaging and printing equipment operation logs and quality inspection reports typically range from 500 to 800 MB. This value covers most business scenarios |
PARSE_FILE_TIMEOUT_SECONDS | 900 seconds | Parsing long-text compliance inspection reports takes significant time. The default timeout duration is insufficient to complete full parsing |
Segment Length | 800–1200 characters | Packaging and printing technical documents often include parameter tables. Too-short segments will destroy table structure, while too-long segments will reduce retrieval accuracy |
DB_CONNECTION_POOL_SIZE | 16–24 | Adapts to 8c16G GPU-free host configurations. Prevents memory overflow caused by an overly large connection pool |
Similarity Threshold | 0.72–0.80 | Fields such as packaging and printing material codes and equipment models have high similarity. A threshold that is too low will introduce a large number of irrelevant retrieval results |
REINDEX_INTERVAL_HOURS | 24 hours | Matches the primary update cycle of industry data. Prevents frequent index rebuilding from consuming excessive database resources |
The parameter values provided on this page are all conventional recommendations used to establish a starting point for configuration. Actual values are affected by material form, data volume, and business rules. Specific issues require individual analysis. It is recommended to test on your own samples before finalizing settings.
Three common mistakes
- An
Invalid array lengtherror appears when selecting question-answer splitting. This error occurs consistently. Cause: Fields such as packaging and printing material color sequence configurations and order additional instructions contain empty array values. The question-answer splitting logic does not filter empty arrays, leading to parsing failure. - Knowledge base index creation fails during PostgreSQL database Docker deployment. Cause: The
DB_CONNECTION_POOL_SIZEparameter was not adjusted. The default connection pool configuration exceeds the memory capacity of the host machine, leading to database connection exhaustion. - Knowledge base content fails to load after restoring project backups. Cause: Only front-end project files were restored, and PostgreSQL database metadata indexes were not synchronized and restored. This results in missing document mapping relationships for the knowledge base.
How to confirm configuration is complete
- Upload a single packaging and printing quality inspection report with a file size not exceeding 1000 MB. Verify that the upload progress completes normally, with no timeout or format error prompts.
- Run a question-answer splitting operation. Confirm that the interface shows no errors, and the generated segmented text retains the structural integrity of the original parameter tables.
- Execute a manual index rebuilding task. Check the database logs for no errors related to connection timeouts or memory overflow.
- Launch a simulated query that includes material codes and unit price fields. Confirm that the units of the retrieved results match the original data, with no format corruption.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-14.