Logical contacts and a try to make NIP-17 more reliable (#667)

* Logical contacts search

* Unified contact search

* Wasm search contact, contact flag, testing

* Increase time slack to 24 hours

* Review fixes

Author: tompro

crates/bcr-ebill-api/src/constants.rs

@@ -6,5 +6,5 @@ pub const MAX_FILE_NAME_CHARACTERS: usize = 200;
 pub const VALID_FILE_MIME_TYPES: [&str; 3] = ["image/jpeg", "image/png", "application/pdf"];
 
 // When subscribing events we subtract this from the last received event time
-pub const NOSTR_EVENT_TIME_SLACK: u64 = 3600; // 1 hour
+pub const NOSTR_EVENT_TIME_SLACK: u64 = 3600 * 24; // 1 day
 pub const CURRENCY_SAT: &str = "sat";