What this type of data looks like
Construction engineering financing daily reports source data from housing and urban-rural development department project filing ledgers, bank financing credit systems, general contractor fund payment vouchers, and other sources. The system updates this data once per day. Documents appear in structured table or list formats, and include fields such as project ID, project name, construction address, general contractor, financing entity, same-day funded amount, cumulative funded amount, financing cost, and repayment plan milestones. Fund amounts use ten thousand yuan as the unit, area uses square meters, and date fields follow the YYYY-MM-DD format.
What constraints do these characteristics impose on the knowledge base retrieval and recall link
Since data updates daily, deploy high-frequency incremental sync to prevent knowledge base content from lagging behind source data. Fields contain highly structured professional terms and clear units, so implement precise field matching to avoid generalized recall of irrelevant financing information. Each daily report typically includes same-day data for multiple construction projects, so distinguish project dimensions to prevent recalling content from unrelated projects. The engineering field has a large number of professional terms, so adapt domain vector training to improve matching accuracy and reduce false recalls.
Configuration Settings
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
chunkSize | 4000-6000 token | Construction financing daily reports include many structured fields. This range retains the complete financing information of a single project, avoids field splitting and breakage, and adapts to the chunking logic of FastGPT 4.6.7 |
maxContext | 10000-16000 characters | The total character count of a single construction financing daily report is approximately 8000-12000. This range fully loads associated segmented content and meets the context requirements of daily queries |
recall count | Top 5-7 entries | A single daily report includes same-day data for multiple projects. This quantity covers the project scope of most common queries and avoids recalling too many irrelevant entries |
similarity threshold | 0.78-0.82 | The construction field has a large number of professional terms. A higher threshold filters irrelevant content from generalized matching and improves accuracy |
rerank return count | Top 3-4 entries | Retain only the most matching financing data to avoid redundant information interfering with the final answer |
knowledge base incremental update frequency | Once per day | Construction financing daily reports update daily, so knowledge base content must sync with source data |
The parameter values provided on this page are common recommendations used to set configuration starting points. Actual values are affected by material form, data volume and business rules. Specific issues require specific analysis. It is recommended to test on your own samples before finalizing.
Three Common Misconfigurations
- Phenomenon: When setting
chunkSizeto 5000 token andmaxContextto 1500 characters, the retrieval results still show content exceeding the citation limit. Cause: The matching relationship betweenchunkSizeandmaxContextwas not adjusted synchronously. The excessively large chunk length causes a single segment to exceed the context limit, and redundant segments are still introduced after automatic truncation by the system. - Phenomenon: After uploading the complete construction financing daily report PDF, the Q&A results show errors confusing "same-day funded amount" and "cumulative funded amount". Cause: The
similarity thresholdwas not set or the threshold was too low, which generalized matched irrelevant content from similar fields in the document and failed to distinguish precise matching of structured fields. - Phenomenon: Irrelevant non-same-day construction financing data is mixed in the knowledge base retrieval results. Cause: The
knowledge base incremental update frequencywas not configured, or the update frequency was lower than the daily report update rhythm, resulting in expired data remaining in the knowledge base.
How to Confirm Proper Configuration
- Upload a single construction financing daily report document, view the parsed segment list, and confirm that each segment contains a complete set of project financing fields without field truncation.
- Initiate a query containing a specific project ID and current day's date, and verify that the number of recalled results matches the set
recall count. - Adjust the
similarity thresholdand initiate the same query, observe the change in the number of retrieval results, and confirm that the threshold takes effect. - Wait for the daily incremental sync task to complete, and verify that the latest data in the knowledge base matches the update time of the source daily report.
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.