OpenTelemetry traces (HTTP → Soroban → DB)

[YaronZaki]

• Difficulty: advanced · Effort: M · Impact: every request
• Expected Outcome
  Spans across HTTP → Soroban RPC → DB call chain. Export both Sentry
  (existing) and OTel collector.
• Files / Modules Affected
  • quantara/web_app/api/main.py
  • quantara/web_app/contract_tools/blockchain_call.py
• Dependencies: standalone.

[Tobi-8]

please maintainer , assign me to this issue. I have looked through your description, and i have had experience in this type of issue.
kindly assign

[grantfox-oss]

🦊 GrantFox — @Tobi-8 has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #292)
2. Your PR will be reviewed by the Quantarq maintainers

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