Remove duplicate pg-hstore entry in package.json

[CryptoJones]

Problem

package.json lists pg-hstore twice with different version pins:

\"pg-hstore\": \"^2.3.4\",
\"pg-hstore\": \"^2.3.3\",

JSON parsers keep only the last duplicate key, so the effective pin is ^2.3.3 — not ^2.3.4. The duplicate is silent (npm install works) but the file is malformed in spirit, gives confusing diffs, and quietly downgrades the dependency.

Fix

Delete the second entry; keep the higher ^2.3.4 pin.

Acceptance criteria

• Exactly one pg-hstore line in package.json.
• Pin is ^2.3.4 (or the latest stable at fix time).
• package-lock.json regenerated and committed.

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