You are checking for contradictions between facts about the same entity.

For each pair below, determine if they genuinely contradict each other.
A contradiction means the two facts CANNOT both be true at the same time.

Pairs to check:
{pairs}

For each pair, respond in JSON array format:
[
  {
    "factA": <id>,
    "factB": <id>,
    "isContradiction": true|false,
    "reason": "brief explanation"
  }
]

Rules:
- Temporal differences are NOT contradictions (e.g. "uses Oracle" and "migrating to PostgreSQL" can coexist)
- Different scopes are NOT contradictions (e.g. "dev uses H2" and "prod uses MySQL")
- Only flag genuine logical conflicts where both cannot be simultaneously true
- Maximum 5 pairs per batch
- Output ONLY the JSON array, no explanation outside it