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Issue title

`self.mapper` used but never assigned in __init__

Curate findings to include

Pick exactly which findings appear in the issue body. By default the top 5 are included. Uncheck noise, check what matters.

Top 5 (default)
Severity Rule Title File:line
CRIT MINED107 Missing import: `queue` used but not imported solutions/system_design/social_graph/so…:17
HIGH SEC029 [SEC029] Server-Side Request Forgery (SSRF) — outbound HTTP from user input: Outbound HTT… solutions/system_design/pastebin/pasteb…:8
HIGH MINED108 `self.manual_overrides` used but never assigned in __init__ solutions/system_design/mint/mint_snipp…:31
HIGH MINED108 `self.reducer` used but never assigned in __init__ solutions/system_design/mint/mint_mapre…:52
HIGH MINED108 `self.mapper` used but never assigned in __init__ solutions/system_design/mint/mint_mapre…:51
HIGH MINED108 `self.mr` used but never assigned in __init__ solutions/system_design/mint/mint_mapre…:51
HIGH MINED108 `self.handle_budget_notifications` used but never assigned in __init__ solutions/system_design/mint/mint_mapre…:45
HIGH MINED108 `self.current_year_month` used but never assigned in __init__ solutions/system_design/mint/mint_mapre…:35
HIGH MINED108 `self.extract_year_month` used but never assigned in __init__ solutions/system_design/mint/mint_mapre…:34
HIGH MINED108 `self._find_available_spot` used but never assigned in __init__ solutions/object_oriented_design/parkin…:87
HIGH MINED108 `self._dispatch_call` used but never assigned in __init__ solutions/object_oriented_design/call_c…:104
HIGH MINED108 `self._dispatch_call` used but never assigned in __init__ solutions/object_oriented_design/call_c…:102
HIGH MINED108 `self._dispatch_call` used but never assigned in __init__ solutions/object_oriented_design/call_c…:100
HIGH MINED108 `self._escalate_call` used but never assigned in __init__ solutions/object_oriented_design/call_c…:60
HIGH MINED108 `self.call` used but never assigned in __init__ solutions/object_oriented_design/call_c…:59
HIGH MINED108 `self._escalate_call` used but never assigned in __init__ solutions/object_oriented_design/call_c…:50
HIGH MINED108 `self.call` used but never assigned in __init__ solutions/object_oriented_design/call_c…:49
HIGH MINED108 `self.possible_scores` used but never assigned in __init__ solutions/object_oriented_design/deck_o…:86
HIGH MINED108 `self._value` used but never assigned in __init__ solutions/object_oriented_design/deck_o…:56
HIGH MINED108 `self._value` used but never assigned in __init__ solutions/object_oriented_design/deck_o…:51
HIGH MINED108 `self.is_face_card` used but never assigned in __init__ solutions/object_oriented_design/deck_o…:48
HIGH MINED108 `self.is_ace` used but never assigned in __init__ solutions/object_oriented_design/deck_o…:46
HIGH MINED108 `self._value` used but never assigned in __init__ solutions/object_oriented_design/deck_o…:42
HIGH MINED108 `self._value` used but never assigned in __init__ solutions/object_oriented_design/deck_o…:38
HIGH MINED108 `self._hash_function` used but never assigned in __init__ solutions/object_oriented_design/hash_t…:33
HIGH MINED108 `self._hash_function` used but never assigned in __init__ solutions/object_oriented_design/hash_t…:26
HIGH MINED108 `self._hash_function` used but never assigned in __init__ solutions/object_oriented_design/hash_t…:18
HIGH CORE_NO_TESTS No test files found —
MED SEC127 [SEC127] AI agent stub — TODO: implement / pass placeholder body: Function body left as T… solutions/object_oriented_design/call_c…:68
MED CORE_NO_CI No CI/CD configuration found —
LOW COMP001 [COMP001] High cognitive complexity: Function `bfs` has cognitive complexity 9 (SonarSour… solutions/system_design/social_graph/so…:13
INFO MINED050 [MINED050] Stub Only Function: Function declared but body is just pass, return None, rais… solutions/object_oriented_design/lru_ca…:15
INFO MINED050 [MINED050] Stub Only Function: Function declared but body is just pass, return None, rais… solutions/object_oriented_design/deck_o…:24
INFO MINED050 [MINED050] Stub Only Function: Function declared but body is just pass, return None, rais… solutions/object_oriented_design/call_c…:34
Reset to top 5 34 findings available (after auto-suppression of test files + won't-fix)

Issue body (markdown)

## Code-quality scan: `donnemartin/system-design-primer`

**Score: 82/100 (C+)**  ·  34 findings  ·  scanned 2026-05-24 01:22 UTC  ·  1,062 LOC

| Severity | Count |
|---|---|
| CRITICAL | 1 |
| HIGH | 27 |
| MEDIUM | 2 |
| LOW | 1 |

📊 [Full filterable report](https://repobility.com/scan/9642fd45-eaae-4159-ae42-d3a6e365cee6/)  ·  ![scorecard](https://repobility.com/scan/9642fd45-eaae-4159-ae42-d3a6e365cee6/report.png?v=1779585747-s2)

### Top findings

1. **CRITICAL** `MINED107` — Missing import: `queue` used but not imported
   `solutions/system_design/social_graph/social_graph_snippets.py:17` · ✓ Repobility
2. **HIGH** `SEC029` — Server-Side Request Forgery (SSRF) — outbound HTTP from user input
   `solutions/system_design/pastebin/pastebin.py:8` · A10:2021 SSRF
3. **HIGH** `MINED108` — `self.manual_overrides` used but never assigned in __init__
   `solutions/system_design/mint/mint_snippets.py:31` · ✓ Repobility
4. **HIGH** `MINED108` — `self.reducer` used but never assigned in __init__
   `solutions/system_design/mint/mint_mapreduce.py:52` · ✓ Repobility
5. **HIGH** `MINED108` — `self.mapper` used but never assigned in __init__
   `solutions/system_design/mint/mint_mapreduce.py:51` · ✓ Repobility

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**Security note**: this issue is public. If any flagged finding is a real, exploitable vulnerability, please redirect to your `SECURITY.md` policy or open a [private security advisory](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability) instead. We're happy to close this and re-submit privately.

---

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