Handles Redis expiry commands: EXPIRE, PEXPIRE, EXPIREAT, PEXPIREAT, TTL, PTTL, PERSIST.

Each handler takes the uppercased command name, a list of string arguments, and an injected store map. Returns plain Elixir terms — the connection layer handles RESP encoding.

Supported commands

• EXPIRE key seconds — set TTL in seconds, returns 1 on success / 0 if key missing
• PEXPIRE key milliseconds — set TTL in milliseconds
• EXPIREAT key unix-timestamp — set absolute expiry (seconds since epoch)
• PEXPIREAT key unix-timestamp-ms — set absolute expiry (milliseconds since epoch)
• TTL key — remaining TTL in seconds (-1 = no expiry, -2 = key missing)
• PTTL key — remaining TTL in milliseconds
• PERSIST key — remove expiry, returns 1 if removed / 0 otherwise