diff --git a/characteristics.go b/characteristics.go
index 51c70a5..3bc9605 100644
--- a/characteristics.go
+++ b/characteristics.go
@@ -24,6 +24,9 @@ type CharacteristicBase struct {
 	CreatedAt            time.Time `db:"created_at" json:"createdAt"`
 	UpdatedAt            time.Time `db:"updated_at" json:"updatedAt"`
 	DeletedAt            NullTime  `db:"deleted_at" json:"deletedAt"`
+	CreatedBy            int64     `db:"created_by" json:"createdBy"`
+	UpdatedBy            int64     `db:"updated_by" json:"updatedBy"`
+	DeletedBy            NullInt64 `db:"deleted_by" json:"deletedBy"`
 }
 
 type Characteristic struct {
diff --git a/measurements.go b/measurements.go
index e06cbfc..b63f254 100644
--- a/measurements.go
+++ b/measurements.go
@@ -35,6 +35,8 @@ type MeasurementBase struct {
 	TestMethodId          NullInt64   `db:"test_method_id" json:"-"`
 	CreatedAt             time.Time   `db:"created_at" json:"createdAt"`
 	UpdatedAt             time.Time   `db:"updated_at" json:"updatedAt"`
+	CreatedBy             int64       `db:"created_by" json:"createdBy"`
+	UpdatedBy             int64       `db:"updated_by" json:"updatedBy"`
 }
 
 // Measurement & MeasurementJSON(s) are what ember expects to see
diff --git a/migrations/00004_AddStrain_up.sql b/migrations/00004_AddStrain_up.sql
index 3b84484..00f9350 100644
--- a/migrations/00004_AddStrain_up.sql
+++ b/migrations/00004_AddStrain_up.sql
@@ -10,15 +10,20 @@ CREATE TABLE strains (
     genbank TEXT NULL,
     isolated_from TEXT NULL,
     notes TEXT NULL,
-    author_id BIGINT NOT NULL,
 
     created_at TIMESTAMP WITH TIME ZONE NOT NULL,
     updated_at TIMESTAMP WITH TIME ZONE NOT NULL,
     deleted_at TIMESTAMP WITH TIME ZONE NULL,
 
+    created_by BIGINT NOT NULL,
+    updated_by BIGINT NOT NULL,
+    deleted_by BIGINT NULL,
+
     CONSTRAINT strain_pkey PRIMARY KEY (id),
     FOREIGN KEY (species_id) REFERENCES species(id),
-    FOREIGN KEY (author_id) REFERENCES users(id)
+    FOREIGN KEY (created_by) REFERENCES users(id),
+    FOREIGN KEY (updated_by) REFERENCES users(id),
+    FOREIGN KEY (deleted_by) REFERENCES users(id)
 );
 
 CREATE INDEX species_id_idx ON strains (species_id);
diff --git a/migrations/00006_AddCharacteristics_up.sql b/migrations/00006_AddCharacteristics_up.sql
index aeab85e..86802cb 100644
--- a/migrations/00006_AddCharacteristics_up.sql
+++ b/migrations/00006_AddCharacteristics_up.sql
@@ -10,8 +10,15 @@ CREATE TABLE characteristics (
     updated_at TIMESTAMP WITH TIME ZONE NOT NULL,
     deleted_at TIMESTAMP WITH TIME ZONE NULL,
 
+    created_by BIGINT NOT NULL,
+    updated_by BIGINT NOT NULL,
+    deleted_by BIGINT NULL,
+
     CONSTRAINT characteristics_pkey PRIMARY KEY (id),
-    FOREIGN KEY (characteristic_type_id) REFERENCES characteristic_types(id)
+    FOREIGN KEY (characteristic_type_id) REFERENCES characteristic_types(id),
+    FOREIGN KEY (created_by) REFERENCES users(id),
+    FOREIGN KEY (updated_by) REFERENCES users(id),
+    FOREIGN KEY (deleted_by) REFERENCES users(id)
 );
 
 CREATE INDEX characteristic_type_id_idx ON characteristics (characteristic_type_id);
diff --git a/migrations/00010_AddMeasurements_up.sql b/migrations/00010_AddMeasurements_up.sql
index ef48b2e..9d7e52b 100644
--- a/migrations/00010_AddMeasurements_up.sql
+++ b/migrations/00010_AddMeasurements_up.sql
@@ -16,6 +16,9 @@ CREATE TABLE measurements (
     created_at TIMESTAMP WITH TIME ZONE NOT NULL,
     updated_at TIMESTAMP WITH TIME ZONE NOT NULL,
 
+    created_by BIGINT NOT NULL,
+    updated_by BIGINT NOT NULL,
+
     CONSTRAINT strainscharmeasurements_pkey PRIMARY KEY (id),
     FOREIGN KEY (strain_id) REFERENCES strains(id),
     FOREIGN KEY (characteristic_id) REFERENCES characteristics(id),
@@ -37,7 +40,9 @@ CREATE TABLE measurements (
             AND txt_value IS NOT NULL
             AND num_value IS NULL
             AND confidence_interval IS NULL
-            AND unit_type_id IS NULL))
+            AND unit_type_id IS NULL)),
+    FOREIGN KEY (created_by) REFERENCES users(id),
+    FOREIGN KEY (updated_by) REFERENCES users(id)
 );
 
 CREATE INDEX strain_id_idx ON measurements (strain_id);
diff --git a/strains.go b/strains.go
index 9a69c14..1215e5e 100644
--- a/strains.go
+++ b/strains.go
@@ -29,10 +29,12 @@ type StrainBase struct {
 	Genbank          NullString `db:"genbank" json:"genbank"`
 	IsolatedFrom     NullString `db:"isolated_from" json:"isolatedFrom"`
 	Notes            NullString `db:"notes" json:"notes"`
-	AuthorId         int64      `db:"author_id" json:"author"`
 	CreatedAt        time.Time  `db:"created_at" json:"createdAt"`
 	UpdatedAt        time.Time  `db:"updated_at" json:"updatedAt"`
 	DeletedAt        NullTime   `db:"deleted_at" json:"deletedAt"`
+	CreatedBy        int64      `db:"created_by" json:"createdBy"`
+	UpdatedBy        int64      `db:"updated_by" json:"updatedBy"`
+	DeletedBy        NullInt64  `db:"deleted_by" json:"deletedBy"`
 }
 
 // Strain & StrainJSON(s) are what ember expects to see