diff --git a/src/core/config/mod.rs b/src/core/config/mod.rs
index 355881b3..753a08fa 100644
--- a/src/core/config/mod.rs
+++ b/src/core/config/mod.rs
@@ -198,6 +198,10 @@ pub struct Config {
 	#[serde(default = "default_eventidshort_cache_capacity")]
 	pub eventidshort_cache_capacity: u32,
 
+	/// default: varies by system
+	#[serde(default = "default_eventid_pdu_cache_capacity")]
+	pub eventid_pdu_cache_capacity: u32,
+
 	/// default: varies by system
 	#[serde(default = "default_shortstatekey_cache_capacity")]
 	pub shortstatekey_cache_capacity: u32,
@@ -2040,6 +2044,8 @@ fn default_shorteventid_cache_capacity() -> u32 { parallelism_scaled_u32(50_000)
 
 fn default_eventidshort_cache_capacity() -> u32 { parallelism_scaled_u32(25_000).saturating_add(100_000) }
 
+fn default_eventid_pdu_cache_capacity() -> u32 { parallelism_scaled_u32(25_000).saturating_add(100_000) }
+
 fn default_shortstatekey_cache_capacity() -> u32 { parallelism_scaled_u32(10_000).saturating_add(100_000) }
 
 fn default_statekeyshort_cache_capacity() -> u32 { parallelism_scaled_u32(10_000).saturating_add(100_000) }
diff --git a/src/database/opts.rs b/src/database/opts.rs
index 46fb4c54..732f571f 100644
--- a/src/database/opts.rs
+++ b/src/database/opts.rs
@@ -136,6 +136,14 @@ pub(crate) fn cf_options(
 			cache_size(cfg, cfg.eventidshort_cache_capacity, 64)?,
 		),
 
+		"eventid_pduid" => set_table_with_new_cache(
+			&mut opts,
+			cfg,
+			cache,
+			name,
+			cache_size(cfg, cfg.eventid_pdu_cache_capacity, 64)?,
+		),
+
 		"shorteventid_authchain" => {
 			set_table_with_new_cache(
 				&mut opts,