add postgres pool size env var

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Overall readability score: 41.07 (🟢 +0)

File	Readability
database.md	26.89 (🔴 -1.95)

View detailed metrics

🟢 - Shows an _increase_ in readability 🔴 - Shows a _decrease_ in readability File | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- [database.md](https://github.com/n8n-io/n8n-docs/blob/f372668c0c797e369072e745a4358c6d2af173ee/docs/hosting/configuration/environment-variables/database.md "docs/hosting/configuration/environment-variables/database.md") | 26.89 | 27.42 | 13.56 | 18.6 | 17.64 | 9.08   | 🔴 -1.95 | 🔴 -0.91 | 🔴 -0.46 | 🟢 +0 | 🔴 -0.24 | 🔴 -0.21 Averages:   | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- Average | 41.07 | 33.64 | 12.03 | 15.36 | 14.45 | 8.67   | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0

View metric targets

Metric | Range | Ideal score --- | --- | --- Flesch Reading Ease | 100 (very easy read) to 0 (extremely difficult read) | 60 Gunning Fog | 6 (very easy read) to 17 (extremely difficult read) | 8 or less Auto. Read. Index | 6 (very easy read) to 14 (extremely difficult read) | 8 or less Coleman Liau Index | 6 (very easy read) to 17 (extremely difficult read) | 8 or less Dale-Chall Readability | 4.9 (very easy read) to 9.9 (extremely difficult read) | 6.9 or less