diff --git a/Cargo.lock b/Cargo.lock
index 05e0c49..6d9a740 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -84,6 +84,12 @@ version = "3.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "79296716171880943b8470b5f8d03aa55eb2e645a4874bdbb28adb49162e012c"
 
+[[package]]
+name = "byteorder"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
+
 [[package]]
 name = "cc"
 version = "1.2.1"
@@ -289,6 +295,7 @@ version = "0.1.0"
 dependencies = [
  "chrono",
  "psychonaut_journal_types",
+ "rand",
  "serde",
 ]
 
@@ -353,6 +360,15 @@ version = "1.20.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1261fe7e33c73b354eab43b1273a57c8f967d0391e80353e51f764ac02cf6775"
 
+[[package]]
+name = "ppv-lite86"
+version = "0.2.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77957b295656769bb8ad2b6a6b09d897d94f05c41b069aede1fcdaa675eaea04"
+dependencies = [
+ "zerocopy",
+]
+
 [[package]]
 name = "prettytable-rs"
 version = "0.10.0"
@@ -406,6 +422,36 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
 [[package]]
 name = "redox_users"
 version = "0.4.6"
@@ -706,3 +752,24 @@ name = "windows_x86_64_msvc"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
+
+[[package]]
+name = "zerocopy"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
+dependencies = [
+ "byteorder",
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
diff --git a/journal/Cargo.toml b/journal/Cargo.toml
index 9253ed1..f7969ec 100644
--- a/journal/Cargo.toml
+++ b/journal/Cargo.toml
@@ -6,4 +6,5 @@ edition = "2021"
 [dependencies]
 serde = { version = "1.0.215", features = ["std", "derive", "serde_derive"] }
 chrono = { version = "0.4.38", features = ["serde"] }
-psychonaut_journal_types = { path = "../psychonaut_journal_types" }
\ No newline at end of file
+psychonaut_journal_types = { path = "../psychonaut_journal_types" }
+rand = "0.8.5"
diff --git a/journal/src/helpers.rs b/journal/src/helpers.rs
index ac0ba5b..f6ab8bf 100644
--- a/journal/src/helpers.rs
+++ b/journal/src/helpers.rs
@@ -1,4 +1,4 @@
-use crate::types::{CustomUnitDose, StandardDose};
+use crate::types::doses::{CustomUnitDose, StandardDose};
 
 pub fn calulate_custom_unit_dose(
 	dose: &CustomUnitDose,
diff --git a/journal/src/journal.rs b/journal/src/journal.rs
new file mode 100644
index 0000000..b77ea4c
--- /dev/null
+++ b/journal/src/journal.rs
@@ -0,0 +1,162 @@
+use chrono::{DateTime, TimeZone, Utc};
+use rand::Rng;
+
+use crate::types::{
+	doses::{CustomUnitDose, Dose, StandardDose, UnknownDose},
+	Consumer, CustomUnit, Estimation, Experience, ExportFormat, Ingestion,
+};
+
+pub type JournalType = Box<dyn Journal>;
+
+pub trait Journal {
+	fn get_custom_unit(&self, id: i64) -> Option<&CustomUnit>;
+	fn get_experience(&self, id: i64) -> Option<&Experience>;
+	fn get_experience_ingestions(&self, id: i64) -> Option<&Vec<Ingestion>>;
+
+	fn first_experience_by_title(&self, title: &str) -> Option<&Experience>;
+	fn maybe_custom_unit(&self, ingestion: &Ingestion) -> Option<&CustomUnit>;
+
+	fn import_psychonaut(&mut self, data: psychonaut_journal_types::ExportData);
+}
+
+pub type InMemJournal = ExportFormat;
+
+impl Journal for InMemJournal {
+	fn get_custom_unit(&self, id: i64) -> Option<&CustomUnit> {
+		self.custom_units.get(&id)
+	}
+
+	fn get_experience(&self, id: i64) -> Option<&Experience> {
+		self.experiences.get(&id)
+	}
+
+	fn get_experience_ingestions(&self, id: i64) -> Option<&Vec<Ingestion>> {
+		self.ingestions.get(&id)
+	}
+
+	fn maybe_custom_unit(&self, ingestion: &Ingestion) -> Option<&CustomUnit> {
+		match &ingestion.dose {
+			Dose::CustomUnit(dose) => self.get_custom_unit(dose.custom_unit_id),
+			_ => None,
+		}
+	}
+
+	fn first_experience_by_title(&self, title: &str) -> Option<&Experience> {
+		self.experiences
+			.values()
+			.find(|&experience| &experience.title == title)
+	}
+
+	fn import_psychonaut(&mut self, data: psychonaut_journal_types::ExportData) {
+		fn from_unix_millis(time: u64) -> DateTime<Utc> {
+			Utc.timestamp_millis_opt(time as i64).unwrap()
+		}
+
+		let mut rng = rand::thread_rng();
+
+		for custom_unit in data.custom_units.into_iter() {
+			let estimation = if custom_unit.is_estimate {
+				if let Some(standard_deviation) = custom_unit.estimate_standard_deviation {
+					Estimation::StandardDeviation(standard_deviation)
+				} else {
+					Estimation::Estimate
+				}
+			} else {
+				Estimation::Precise
+			};
+
+			let dose = CustomUnitDose {
+				dose: custom_unit.dose,
+				unit: custom_unit.unit,
+				original_unit: custom_unit.original_unit,
+				custom_unit_id: custom_unit.id,
+				estimation,
+			};
+
+			self.custom_units.insert(
+				custom_unit.id,
+				CustomUnit {
+					id: custom_unit.id,
+					name: custom_unit.name,
+					substance_name: custom_unit.substance_name,
+
+					administration_route: custom_unit.administration_route,
+					dose,
+
+					creation_time: from_unix_millis(custom_unit.creation_time),
+					is_archived: custom_unit.is_archived,
+				},
+			);
+		}
+
+		for experience in data.experiences.into_iter() {
+			let experience_id = rng.gen::<i64>();
+
+			let mut ingestions: Vec<Ingestion> = Vec::new();
+			for ingestion in experience.ingestions.into_iter() {
+				let estimation = if !ingestion.is_estimate {
+					Estimation::Precise
+				} else if let Some(standard_deviation) = ingestion.estimate_standard_deviation {
+					Estimation::StandardDeviation(standard_deviation)
+				} else {
+					Estimation::Estimate
+				};
+
+				let dose = if let Some(dose) = ingestion.dose {
+					if let Some(custom_unit_id) = ingestion.custom_unit_id {
+						let custom_unit = self
+							.custom_units
+							.get(&custom_unit_id)
+							.expect("custom unit not found");
+
+						Dose::CustomUnit(CustomUnitDose {
+							dose,
+							unit: custom_unit.dose.unit.clone(),
+							original_unit: custom_unit.dose.original_unit.clone(),
+							estimation,
+							custom_unit_id,
+						})
+					} else {
+						Dose::Standard(StandardDose {
+							dose,
+							unit: ingestion.unit,
+							estimation,
+							contains_unknown: false,
+						})
+					}
+				} else {
+					Dose::Unknown(UnknownDose {
+						unit: ingestion.unit,
+					})
+				};
+
+				ingestions.push(Ingestion {
+					substance_name: ingestion.substance_name,
+					ingestion_time: from_unix_millis(ingestion.ingestion_time),
+					creation_time: from_unix_millis(ingestion.creation_time),
+					dose,
+					roa: ingestion.roa,
+					consumer: match ingestion.consumer_name {
+						Some(name) => Consumer::Named(name),
+						None => Consumer::Default,
+					},
+					notes: ingestion.notes,
+					stomach_fullness: ingestion.stomach_fullness,
+				})
+			}
+
+			self.ingestions.insert(experience_id, ingestions);
+
+			self.experiences.insert(
+				experience_id,
+				Experience {
+					id: experience_id,
+					title: experience.title,
+					text: experience.text,
+					creation_time: from_unix_millis(experience.creation_time),
+					modified_time: from_unix_millis(experience.modified_time),
+				},
+			);
+		}
+	}
+}
diff --git a/journal/src/lib.rs b/journal/src/lib.rs
index 52af0f9..48e324e 100644
--- a/journal/src/lib.rs
+++ b/journal/src/lib.rs
@@ -1,2 +1,3 @@
 pub mod helpers;
+pub mod journal;
 pub mod types;
diff --git a/journal/src/types.rs b/journal/src/types.rs
deleted file mode 100644
index fdee166..0000000
--- a/journal/src/types.rs
+++ /dev/null
@@ -1,345 +0,0 @@
-use chrono::{DateTime, TimeZone, Utc};
-use std::collections::HashMap;
-use std::fmt::{Debug, Display};
-use std::ops::{Add, Mul};
-use std::str::FromStr;
-
-pub type AdministrationRoute = psychonaut_journal_types::AdministrationRoute;
-
-#[derive(PartialEq, Debug, Copy, Clone)]
-pub enum Estimation {
-	Precise,
-	Estimate,
-	StandardDeviation(f64),
-}
-
-impl Estimation {
-	pub fn is_precise(&self) -> bool {
-		matches!(self, Estimation::Precise)
-	}
-	pub fn is_estimate(&self) -> bool {
-		!matches!(self, Estimation::Precise)
-	}
-	pub fn is_standard_deviation(&self) -> bool {
-		matches!(self, Estimation::StandardDeviation(_))
-	}
-}
-
-impl Add for Estimation {
-	type Output = Self;
-
-	fn add(self, rhs: Self) -> Self::Output {
-		match (self, rhs) {
-			(Estimation::StandardDeviation(x), Estimation::StandardDeviation(y)) => {
-				Estimation::StandardDeviation(x + y)
-			}
-			(Estimation::StandardDeviation(x), _) | (_, Estimation::StandardDeviation(x)) => {
-				Estimation::StandardDeviation(x)
-			}
-			(Estimation::Estimate, _) | (_, Estimation::Estimate) => Estimation::Estimate,
-			(Estimation::Precise, Estimation::Precise) => Estimation::Precise,
-		}
-	}
-}
-
-impl Mul for Estimation {
-	type Output = Self;
-
-	fn mul(self, rhs: Self) -> Self::Output {
-		match (self, rhs) {
-			(Estimation::StandardDeviation(x), Estimation::StandardDeviation(y)) => {
-				Estimation::StandardDeviation(x * y)
-			}
-			(Estimation::StandardDeviation(x), _) | (_, Estimation::StandardDeviation(x)) => {
-				Estimation::StandardDeviation(x)
-			}
-			(Estimation::Estimate, _) | (_, Estimation::Estimate) => Estimation::Estimate,
-			(Estimation::Precise, Estimation::Precise) => Estimation::Precise,
-		}
-	}
-}
-
-#[derive(Debug, Clone)]
-pub struct UnknownDose {
-	pub unit: String,
-}
-
-#[derive(Debug, Clone)]
-pub struct StandardDose {
-	pub dose: f64,
-	pub unit: String,
-	pub contains_unknown: bool,
-	pub estimation: Estimation,
-}
-
-impl Add for StandardDose {
-	type Output = Self;
-
-	fn add(self, rhs: Self) -> Self::Output {
-		StandardDose {
-			dose: self.dose + rhs.dose,
-			unit: self.unit,
-			contains_unknown: self.contains_unknown || rhs.contains_unknown,
-			estimation: self.estimation + rhs.estimation,
-		}
-	}
-}
-
-impl Mul for StandardDose {
-	type Output = Self;
-
-	fn mul(self, rhs: Self) -> Self::Output {
-		StandardDose {
-			dose: self.dose * rhs.dose,
-			unit: self.unit,
-			contains_unknown: self.contains_unknown || rhs.contains_unknown,
-			estimation: {
-				let estimation = self.estimation + rhs.estimation;
-				if let Estimation::StandardDeviation(deviation) = estimation {
-					Estimation::StandardDeviation(deviation * rhs.dose)
-				} else {
-					estimation
-				}
-			},
-		}
-	}
-}
-
-impl From<CustomUnitDose> for StandardDose {
-	fn from(value: CustomUnitDose) -> StandardDose {
-		StandardDose {
-			dose: value.dose,
-			unit: value.original_unit,
-			contains_unknown: false,
-			estimation: value.estimation,
-		}
-	}
-}
-
-#[derive(Debug, Clone)]
-pub struct CustomUnitDose {
-	pub dose: f64,
-	pub unit: String,
-	pub original_unit: String,
-	pub estimation: Estimation,
-	pub custom_unit_id: i64,
-}
-
-#[derive(Debug, Clone)]
-pub enum Dose {
-	Unknown(UnknownDose),
-	Standard(StandardDose),
-	CustomUnit(CustomUnitDose),
-}
-
-#[derive(PartialEq, Debug, Clone)]
-pub enum Consumer {
-	Default,
-	Named(String),
-}
-
-impl FromStr for Consumer {
-	type Err = core::convert::Infallible;
-
-	fn from_str(s: &str) -> Result<Self, Self::Err> {
-		if s == "default" {
-			Ok(Consumer::Default)
-		} else {
-			Ok(Consumer::Named(s.to_string()))
-		}
-	}
-}
-
-impl Display for Consumer {
-	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-		match self {
-			Consumer::Default => f.write_str("default"),
-			Consumer::Named(name) => f.write_str(name),
-		}
-	}
-}
-
-#[derive(Debug, Clone)]
-pub struct Ingestion {
-	pub substance_name: String,
-	pub ingestion_time: DateTime<Utc>,
-	pub creation_time: DateTime<Utc>,
-	pub dose: Dose,
-	pub roa: AdministrationRoute,
-	pub consumer: Consumer,
-	pub notes: String,
-	pub stomach_fullness: Option<String>,
-}
-
-#[derive(Debug, Clone)]
-pub struct CustomSubstance {
-	pub name: String,
-	pub description: String,
-	pub units: String,
-}
-
-#[derive(Debug, Clone)]
-pub struct Experience {
-	pub title: String,
-	pub text: String,
-	pub creation_time: DateTime<Utc>,
-	pub modified_time: DateTime<Utc>,
-	pub ingestions: Vec<Ingestion>,
-}
-
-#[derive(Debug, Clone)]
-pub struct CustomUnit {
-	pub id: i64,
-	pub name: String,
-	pub substance_name: String,
-
-	pub administration_route: AdministrationRoute,
-	pub dose: CustomUnitDose,
-
-	pub creation_time: DateTime<Utc>,
-	pub is_archived: bool,
-}
-
-#[derive(Debug, Default, Clone)]
-pub struct Journal {
-	pub experiences: Vec<Experience>,
-	//pub substance_colours: HashMap<String, String>,
-	//pub custom_substances: HashMap<String, CustomSubstance>,
-	pub custom_units: HashMap<i64, CustomUnit>,
-}
-
-impl Journal {
-	pub fn get_custom_unit(&self, id: i64) -> Option<CustomUnit> {
-		self.custom_units.get(&id).cloned()
-	}
-
-	pub fn maybe_custom_unit(&self, ingestion: &Ingestion) -> Option<CustomUnit> {
-		match &ingestion.dose {
-			Dose::CustomUnit(dose) => self.get_custom_unit(dose.custom_unit_id),
-			_ => None,
-		}
-	}
-
-	pub fn first_experience_by_title(&self, title: &String) -> Option<Experience> {
-		for experience in self.experiences.iter() {
-			if &experience.title == title {
-				return Some(experience.clone());
-			}
-		}
-
-		None
-	}
-
-	pub fn import(data: psychonaut_journal_types::ExportData) -> Self {
-		fn from_unix_millis(time: u64) -> DateTime<Utc> {
-			Utc.timestamp_millis_opt(time as i64).unwrap()
-		}
-
-		let mut journal = Journal::default();
-
-		for custom_unit in data.custom_units.into_iter() {
-			journal.custom_units.insert(
-				custom_unit.id,
-				CustomUnit {
-					id: custom_unit.id,
-					name: custom_unit.name,
-					substance_name: custom_unit.substance_name,
-
-					administration_route: custom_unit.administration_route,
-					dose: CustomUnitDose {
-						dose: custom_unit.dose,
-						unit: custom_unit.unit,
-						original_unit: custom_unit.original_unit,
-						custom_unit_id: custom_unit.id,
-						estimation: if custom_unit.is_estimate {
-							if let Some(standard_deviation) =
-								custom_unit.estimate_standard_deviation
-							{
-								Estimation::StandardDeviation(standard_deviation)
-							} else {
-								Estimation::Estimate
-							}
-						} else {
-							Estimation::Precise
-						},
-					},
-
-					creation_time: from_unix_millis(custom_unit.creation_time),
-					is_archived: custom_unit.is_archived,
-				},
-			);
-		}
-
-		for experience in data.experiences.into_iter() {
-			let mut ingestions: Vec<Ingestion> = Vec::new();
-
-			for ingestion in experience.ingestions.into_iter() {
-				fn ingestion_estimation(
-					ingestion: &psychonaut_journal_types::Ingestion,
-				) -> Estimation {
-					if !ingestion.is_estimate {
-						Estimation::Precise
-					} else if let Some(standard_deviation) = ingestion.estimate_standard_deviation {
-						Estimation::StandardDeviation(standard_deviation)
-					} else {
-						Estimation::Estimate
-					}
-				}
-
-				let estimation = ingestion_estimation(&ingestion);
-
-				ingestions.push(Ingestion {
-					substance_name: ingestion.substance_name,
-					ingestion_time: from_unix_millis(ingestion.ingestion_time),
-					creation_time: from_unix_millis(ingestion.creation_time),
-					dose: {
-						if let Some(dose) = ingestion.dose {
-							if let Some(custom_unit_id) = ingestion.custom_unit_id {
-								let custom_unit = journal
-									.custom_units
-									.get(&custom_unit_id)
-									.expect("custom unit not found");
-
-								Dose::CustomUnit(CustomUnitDose {
-									dose,
-									unit: custom_unit.dose.unit.clone(),
-									original_unit: custom_unit.dose.original_unit.clone(),
-									estimation,
-									custom_unit_id,
-								})
-							} else {
-								Dose::Standard(StandardDose {
-									dose,
-									unit: ingestion.unit,
-									estimation,
-									contains_unknown: false,
-								})
-							}
-						} else {
-							Dose::Unknown(UnknownDose {
-								unit: ingestion.unit,
-							})
-						}
-					},
-					roa: ingestion.roa,
-					consumer: match ingestion.consumer_name {
-						Some(name) => Consumer::Named(name),
-						None => Consumer::Default,
-					},
-					notes: ingestion.notes,
-					stomach_fullness: ingestion.stomach_fullness,
-				})
-			}
-
-			journal.experiences.push(Experience {
-				title: experience.title,
-				text: experience.text,
-				creation_time: from_unix_millis(experience.creation_time),
-				modified_time: from_unix_millis(experience.modified_time),
-				ingestions,
-			});
-		}
-
-		journal
-	}
-}
diff --git a/journal/src/types/consumer.rs b/journal/src/types/consumer.rs
new file mode 100644
index 0000000..d71d541
--- /dev/null
+++ b/journal/src/types/consumer.rs
@@ -0,0 +1,28 @@
+use std::{fmt::Display, str::FromStr};
+
+#[derive(PartialEq, Debug, Clone)]
+pub enum Consumer {
+	Default,
+	Named(String),
+}
+
+impl FromStr for Consumer {
+	type Err = core::convert::Infallible;
+
+	fn from_str(s: &str) -> Result<Self, Self::Err> {
+		if s == "default" {
+			Ok(Consumer::Default)
+		} else {
+			Ok(Consumer::Named(s.to_string()))
+		}
+	}
+}
+
+impl Display for Consumer {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		match self {
+			Consumer::Default => f.write_str("default"),
+			Consumer::Named(name) => f.write_str(name),
+		}
+	}
+}
diff --git a/journal/src/types/custom_substance.rs b/journal/src/types/custom_substance.rs
new file mode 100644
index 0000000..4e7f541
--- /dev/null
+++ b/journal/src/types/custom_substance.rs
@@ -0,0 +1,6 @@
+#[derive(Debug, Clone)]
+pub struct CustomSubstance {
+	pub name: String,
+	pub description: String,
+	pub units: String,
+}
diff --git a/journal/src/types/custom_unit.rs b/journal/src/types/custom_unit.rs
new file mode 100644
index 0000000..f399f50
--- /dev/null
+++ b/journal/src/types/custom_unit.rs
@@ -0,0 +1,15 @@
+use crate::types::{doses::CustomUnitDose, AdministrationRoute};
+use chrono::{DateTime, Utc};
+
+#[derive(Debug, Clone)]
+pub struct CustomUnit {
+	pub id: i64,
+	pub name: String,
+	pub substance_name: String,
+
+	pub administration_route: AdministrationRoute,
+	pub dose: CustomUnitDose,
+
+	pub creation_time: DateTime<Utc>,
+	pub is_archived: bool,
+}
diff --git a/journal/src/types/doses.rs b/journal/src/types/doses.rs
new file mode 100644
index 0000000..1eac045
--- /dev/null
+++ b/journal/src/types/doses.rs
@@ -0,0 +1,76 @@
+use std::ops::{Add, Mul};
+
+use crate::types::Estimation;
+
+#[derive(Debug, Clone)]
+pub enum Dose {
+	Unknown(UnknownDose),
+	Standard(StandardDose),
+	CustomUnit(CustomUnitDose),
+}
+
+#[derive(Debug, Clone)]
+pub struct UnknownDose {
+	pub unit: String,
+}
+
+#[derive(Debug, Clone)]
+pub struct StandardDose {
+	pub dose: f64,
+	pub unit: String,
+	pub contains_unknown: bool,
+	pub estimation: Estimation,
+}
+
+#[derive(Debug, Clone)]
+pub struct CustomUnitDose {
+	pub dose: f64,
+	pub unit: String,
+	pub original_unit: String,
+	pub estimation: Estimation,
+	pub custom_unit_id: i64,
+}
+
+impl Add for StandardDose {
+	type Output = Self;
+
+	fn add(self, rhs: Self) -> Self::Output {
+		StandardDose {
+			dose: self.dose + rhs.dose,
+			unit: self.unit,
+			contains_unknown: self.contains_unknown || rhs.contains_unknown,
+			estimation: self.estimation + rhs.estimation,
+		}
+	}
+}
+
+impl Mul for StandardDose {
+	type Output = Self;
+
+	fn mul(self, rhs: Self) -> Self::Output {
+		StandardDose {
+			dose: self.dose * rhs.dose,
+			unit: self.unit,
+			contains_unknown: self.contains_unknown || rhs.contains_unknown,
+			estimation: {
+				let estimation = self.estimation + rhs.estimation;
+				if let Estimation::StandardDeviation(deviation) = estimation {
+					Estimation::StandardDeviation(deviation * rhs.dose)
+				} else {
+					estimation
+				}
+			},
+		}
+	}
+}
+
+impl From<CustomUnitDose> for StandardDose {
+	fn from(value: CustomUnitDose) -> StandardDose {
+		StandardDose {
+			dose: value.dose,
+			unit: value.original_unit,
+			contains_unknown: false,
+			estimation: value.estimation,
+		}
+	}
+}
diff --git a/journal/src/types/estimate.rs b/journal/src/types/estimate.rs
new file mode 100644
index 0000000..d0d502a
--- /dev/null
+++ b/journal/src/types/estimate.rs
@@ -0,0 +1,54 @@
+use std::ops::{Add, Mul};
+
+#[derive(PartialEq, Debug, Copy, Clone)]
+pub enum Estimation {
+	Precise,
+	Estimate,
+	StandardDeviation(f64),
+}
+
+impl Estimation {
+	pub fn is_precise(&self) -> bool {
+		matches!(self, Estimation::Precise)
+	}
+	pub fn is_estimate(&self) -> bool {
+		!matches!(self, Estimation::Precise)
+	}
+	pub fn is_standard_deviation(&self) -> bool {
+		matches!(self, Estimation::StandardDeviation(_))
+	}
+}
+
+impl Add for Estimation {
+	type Output = Self;
+
+	fn add(self, rhs: Self) -> Self::Output {
+		match (self, rhs) {
+			(Estimation::StandardDeviation(x), Estimation::StandardDeviation(y)) => {
+				Estimation::StandardDeviation(x + y)
+			}
+			(Estimation::StandardDeviation(x), _) | (_, Estimation::StandardDeviation(x)) => {
+				Estimation::StandardDeviation(x)
+			}
+			(Estimation::Estimate, _) | (_, Estimation::Estimate) => Estimation::Estimate,
+			(Estimation::Precise, Estimation::Precise) => Estimation::Precise,
+		}
+	}
+}
+
+impl Mul for Estimation {
+	type Output = Self;
+
+	fn mul(self, rhs: Self) -> Self::Output {
+		match (self, rhs) {
+			(Estimation::StandardDeviation(x), Estimation::StandardDeviation(y)) => {
+				Estimation::StandardDeviation(x * y)
+			}
+			(Estimation::StandardDeviation(x), _) | (_, Estimation::StandardDeviation(x)) => {
+				Estimation::StandardDeviation(x)
+			}
+			(Estimation::Estimate, _) | (_, Estimation::Estimate) => Estimation::Estimate,
+			(Estimation::Precise, Estimation::Precise) => Estimation::Precise,
+		}
+	}
+}
diff --git a/journal/src/types/experience.rs b/journal/src/types/experience.rs
new file mode 100644
index 0000000..482fd56
--- /dev/null
+++ b/journal/src/types/experience.rs
@@ -0,0 +1,10 @@
+use chrono::{DateTime, Utc};
+
+#[derive(Debug, Clone)]
+pub struct Experience {
+	pub id: i64,
+	pub title: String,
+	pub text: String,
+	pub creation_time: DateTime<Utc>,
+	pub modified_time: DateTime<Utc>,
+}
diff --git a/journal/src/types/export.rs b/journal/src/types/export.rs
new file mode 100644
index 0000000..c57749c
--- /dev/null
+++ b/journal/src/types/export.rs
@@ -0,0 +1,10 @@
+use std::collections::HashMap;
+
+use crate::types::{CustomUnit, Experience, Ingestion};
+
+#[derive(Debug, Default, Clone)]
+pub struct ExportFormat {
+	pub ingestions: HashMap<i64, Vec<Ingestion>>,
+	pub experiences: HashMap<i64, Experience>,
+	pub custom_units: HashMap<i64, CustomUnit>,
+}
diff --git a/journal/src/types/ingestion.rs b/journal/src/types/ingestion.rs
new file mode 100644
index 0000000..446eddb
--- /dev/null
+++ b/journal/src/types/ingestion.rs
@@ -0,0 +1,15 @@
+use chrono::{DateTime, Utc};
+
+use crate::types::{doses::Dose, AdministrationRoute, Consumer};
+
+#[derive(Debug, Clone)]
+pub struct Ingestion {
+	pub substance_name: String,
+	pub ingestion_time: DateTime<Utc>,
+	pub creation_time: DateTime<Utc>,
+	pub dose: Dose,
+	pub roa: AdministrationRoute,
+	pub consumer: Consumer,
+	pub notes: String,
+	pub stomach_fullness: Option<String>,
+}
diff --git a/journal/src/types/mod.rs b/journal/src/types/mod.rs
new file mode 100644
index 0000000..1d356cf
--- /dev/null
+++ b/journal/src/types/mod.rs
@@ -0,0 +1,24 @@
+mod estimate;
+pub use estimate::Estimation;
+
+pub mod doses;
+
+mod consumer;
+pub use consumer::Consumer;
+
+mod ingestion;
+pub use ingestion::Ingestion;
+
+mod custom_substance;
+pub use custom_substance::CustomSubstance;
+
+mod experience;
+pub use experience::Experience;
+
+mod custom_unit;
+pub use custom_unit::CustomUnit;
+
+mod export;
+pub use export::ExportFormat;
+
+pub type AdministrationRoute = psychonaut_journal_types::AdministrationRoute;
diff --git a/journal_cli/src/args.rs b/journal_cli/src/args.rs
index 294ff98..72ef10b 100644
--- a/journal_cli/src/args.rs
+++ b/journal_cli/src/args.rs
@@ -1,14 +1,30 @@
 use clap::{Parser, Subcommand};
 
 #[derive(Debug, Clone, Subcommand)]
-#[clap(rename_all = "camelCase")]
+#[command(rename_all = "camelCase")]
 pub enum Commands {
 	PrintExperience(crate::commands::print_experience::PrintExperienceArgs),
 }
 
-#[derive(Debug, Parser)]
-#[clap()]
-pub struct Args {
-	#[clap(subcommand)]
-	pub command: Commands,
+// TODO: add env vars back to this,
+// clashes with multiple=false when one set as env and other as arg
+#[derive(Debug, Clone, clap::Args)]
+#[group(required = false, multiple = false)]
+pub struct JournalFileArgs {
+	// journal file is writable
+	// #[arg(group = "journal_file_args", global = true, long)]
+	// pub journal_file: Option<String>,
+
+	// export file is read-only
+	#[arg(group = "journal_file", global = true, long)]
+	pub psychonaut_export_file: Option<String>,
+}
+
+#[derive(Debug, Parser)]
+pub struct Args {
+	#[command(subcommand)]
+	pub command: Commands,
+
+	#[command(flatten)]
+	pub journal_file_args: JournalFileArgs,
 }
diff --git a/journal_cli/src/commands/print_experience.rs b/journal_cli/src/commands/print_experience.rs
index ee4ca4e..9cc0e4b 100644
--- a/journal_cli/src/commands/print_experience.rs
+++ b/journal_cli/src/commands/print_experience.rs
@@ -9,12 +9,14 @@ use crate::utils::load_journal;
 
 #[derive(Debug, Clone, clap::Args)]
 pub struct PrintExperienceArgs {
+	#[arg(requires = "journal_file")]
 	pub experience_title: String,
-	#[clap(long, env = "EXPORT_FILE")]
-	pub export_file: String,
-	#[clap(long)]
+
+	pub _x: (),
+
+	#[arg(long)]
 	pub substance_filter: Option<Vec<String>>,
-	#[clap(long, value_delimiter = ',')]
+	#[arg(long, value_delimiter = ',')]
 	pub consumer_filter: Option<Vec<String>>,
 }
 
@@ -37,10 +39,17 @@ pub fn parse_consumer_filter(consumer_filter: Option<Vec<String>>) -> Option<Vec
 }
 
 pub fn print_experience(
-	_global_args: &Args,
+	global_args: &Args,
 	args: &PrintExperienceArgs,
 ) -> Result<(), Box<dyn std::error::Error>> {
-	let journal = load_journal(&args.export_file).expect("could not load export data");
+	let journal = load_journal(
+		&global_args
+			.journal_file_args
+			.psychonaut_export_file
+			.clone()
+			.unwrap(),
+	)
+	.expect("could not load export data");
 
 	let experience = journal
 		.first_experience_by_title(&args.experience_title)
@@ -48,14 +57,14 @@ pub fn print_experience(
 
 	//println!("{:#?}", &experience);
 
-	println!("{}", format_experience_title(&experience));
+	println!("{}", format_experience_title(experience));
 
 	let substance_filter = args.substance_filter.clone();
 	let consumer_filter = parse_consumer_filter(args.consumer_filter.clone());
 
 	print_ingestion_log(
 		&journal,
-		&experience,
+		experience,
 		substance_filter.as_ref(),
 		consumer_filter.as_ref(),
 	);
diff --git a/journal_cli/src/display.rs b/journal_cli/src/display.rs
index 44f5f46..be3a2cf 100644
--- a/journal_cli/src/display.rs
+++ b/journal_cli/src/display.rs
@@ -1,14 +1,21 @@
-use journal::types::{Consumer, Experience, Journal};
+use journal::{
+	journal::JournalType,
+	types::{Consumer, Experience},
+};
 
 use crate::formatting::{format_ingestion_dose, format_ingestion_roa, format_ingestion_time};
 
 pub fn print_ingestion_log(
-	journal: &Journal,
+	journal: &JournalType,
 	experience: &Experience,
 	substance_filter: Option<&Vec<String>>,
 	consumer_filter: Option<&Vec<Consumer>>,
 ) {
-	for ingestion in experience.ingestions.iter() {
+	for ingestion in journal
+		.get_experience_ingestions(experience.id)
+		.expect("could not find ingestions for experience")
+		.iter()
+	{
 		if let Some(substance_filter) = substance_filter {
 			if !substance_filter.contains(&ingestion.substance_name) {
 				continue;
@@ -22,14 +29,13 @@ pub fn print_ingestion_log(
 		}
 
 		let custom_unit = journal.maybe_custom_unit(ingestion);
-
-		//println!("{:#?} {:#?}", &ingestion, &custom_unit);
+		// println!("{:#?} {:#?}", &ingestion, &custom_unit);
 
 		println!(
 			"{}|{}|{}|{}|{}",
 			ingestion.substance_name,
-			format_ingestion_dose(&ingestion.dose, custom_unit.as_ref().map(|f| &f.dose)),
-			format_ingestion_roa(ingestion, custom_unit.as_ref()),
+			format_ingestion_dose(&ingestion.dose, custom_unit.map(|f| &f.dose)),
+			format_ingestion_roa(ingestion, custom_unit),
 			ingestion.consumer,
 			format_ingestion_time(ingestion)
 		)
diff --git a/journal_cli/src/formatting.rs b/journal_cli/src/formatting.rs
index f8532a4..a46522a 100644
--- a/journal_cli/src/formatting.rs
+++ b/journal_cli/src/formatting.rs
@@ -1,6 +1,9 @@
 use journal::{
 	helpers::calulate_custom_unit_dose,
-	types::{CustomUnit, CustomUnitDose, Dose, Estimation, Experience, Ingestion, StandardDose},
+	types::{
+		doses::{CustomUnitDose, Dose, StandardDose},
+		CustomUnit, Estimation, Experience, Ingestion,
+	},
 };
 
 pub fn format_experience_title(experience: &Experience) -> String {
diff --git a/journal_cli/src/utils.rs b/journal_cli/src/utils.rs
index f06aa38..5def5ca 100644
--- a/journal_cli/src/utils.rs
+++ b/journal_cli/src/utils.rs
@@ -1,13 +1,14 @@
-use journal::types::Journal;
+use journal::journal::{InMemJournal, Journal, JournalType};
 use psychonaut_journal_types::ExportData;
 use std::fs::File;
 
-pub fn load_journal(filename: &String) -> Result<Journal, Box<dyn std::error::Error>> {
+pub fn load_journal(filename: &String) -> Result<JournalType, Box<dyn std::error::Error>> {
 	let file = File::open(filename)?;
 
 	let export_data: ExportData = serde_json::from_reader(file)?;
 
-	let journal = Journal::import(export_data);
+	let mut journal = InMemJournal::default();
+	journal.import_psychonaut(export_data);
 
-	Ok(journal)
+	Ok(Box::new(journal))
 }