diff --git a/yml/apdb.yaml b/yml/apdb.yaml
index 77e665ce..1b7bf333 100644
--- a/yml/apdb.yaml
+++ b/yml/apdb.yaml
@@ -153,7 +153,6 @@ tables:
   - name: pmParallaxNdata
     "@id": "#DiaObject.pmParallaxNdata"
     datatype: int
-    nullable: false
     description: The number of data points used to fit the model.
     mysql:datatype: INTEGER
   - name: u_psfFluxMean
@@ -170,8 +169,8 @@ tables:
     mysql:datatype: FLOAT
     fits:tunit: nJy
     ivoa:ucd: stat.error
-  - name: u_psfFluxSigma
-    "@id": "#DiaObject.u_psfFluxSigma"
+  - name: u_psfFluxErr
+    "@id": "#DiaObject.u_psfFluxErr"
     datatype: float
     description: Standard deviation of the distribution of u_psfFlux.
     mysql:datatype: FLOAT
@@ -186,7 +185,6 @@ tables:
   - name: u_psfFluxNdata
     "@id": "#DiaObject.u_psfFluxNdata"
     datatype: int
-    nullable: false
     description: The number of data points used to compute u_psfFluxChi2.
     mysql:datatype: INTEGER
   - name: u_fpFluxMean
@@ -203,8 +201,8 @@ tables:
     mysql:datatype: FLOAT
     fits:tunit: nJy
     ivoa:ucd: stat.error
-  - name: u_fpFluxSigma
-    "@id": "#DiaObject.u_fpFluxSigma"
+  - name: u_fpFluxErr
+    "@id": "#DiaObject.u_fpFluxErr"
     datatype: float
     description: Standard deviation of the distribution of u_fpFlux.
     mysql:datatype: FLOAT
@@ -224,8 +222,8 @@ tables:
     mysql:datatype: FLOAT
     fits:tunit: nJy
     ivoa:ucd: stat.error
-  - name: g_psfFluxSigma
-    "@id": "#DiaObject.g_psfFluxSigma"
+  - name: g_psfFluxErr
+    "@id": "#DiaObject.g_psfFluxErr"
     datatype: float
     description: Standard deviation of the distribution of g_psfFlux.
     mysql:datatype: FLOAT
@@ -240,7 +238,6 @@ tables:
   - name: g_psfFluxNdata
     "@id": "#DiaObject.g_psfFluxNdata"
     datatype: int
-    nullable: false
     description: The number of data points used to compute g_psfFluxChi2.
     mysql:datatype: INTEGER
   - name: g_fpFluxMean
@@ -257,8 +254,8 @@ tables:
     mysql:datatype: FLOAT
     fits:tunit: nJy
     ivoa:ucd: stat.error
-  - name: g_fpFluxSigma
-    "@id": "#DiaObject.g_fpFluxSigma"
+  - name: g_fpFluxErr
+    "@id": "#DiaObject.g_fpFluxErr"
     datatype: float
     description: Standard deviation of the distribution of g_fpFlux.
     mysql:datatype: FLOAT
@@ -278,8 +275,8 @@ tables:
     mysql:datatype: FLOAT
     fits:tunit: nJy
     ivoa:ucd: stat.error
-  - name: r_psfFluxSigma
-    "@id": "#DiaObject.r_psfFluxSigma"
+  - name: r_psfFluxErr
+    "@id": "#DiaObject.r_psfFluxErr"
     datatype: float
     description: Standard deviation of the distribution of r_psfFlux.
     mysql:datatype: FLOAT
@@ -294,7 +291,6 @@ tables:
   - name: r_psfFluxNdata
     "@id": "#DiaObject.r_psfFluxNdata"
     datatype: int
-    nullable: false
     description: The number of data points used to compute r_psfFluxChi2.
     mysql:datatype: INTEGER
   - name: r_fpFluxMean
@@ -311,8 +307,8 @@ tables:
     mysql:datatype: FLOAT
     fits:tunit: nJy
     ivoa:ucd: stat.error
-  - name: r_fpFluxSigma
-    "@id": "#DiaObject.r_fpFluxSigma"
+  - name: r_fpFluxErr
+    "@id": "#DiaObject.r_fpFluxErr"
     datatype: float
     description: Standard deviation of the distribution of r_fpFlux.
     mysql:datatype: FLOAT
@@ -332,8 +328,8 @@ tables:
     mysql:datatype: FLOAT
     fits:tunit: nJy
     ivoa:ucd: stat.error
-  - name: i_psfFluxSigma
-    "@id": "#DiaObject.i_psfFluxSigma"
+  - name: i_psfFluxErr
+    "@id": "#DiaObject.i_psfFluxErr"
     datatype: float
     description: Standard deviation of the distribution of i_psfFlux.
     mysql:datatype: FLOAT
@@ -348,7 +344,6 @@ tables:
   - name: i_psfFluxNdata
     "@id": "#DiaObject.i_psfFluxNdata"
     datatype: int
-    nullable: false
     description: The number of data points used to compute i_psfFluxChi2.
     mysql:datatype: INTEGER
   - name: i_fpFluxMean
@@ -365,8 +360,8 @@ tables:
     mysql:datatype: FLOAT
     fits:tunit: nJy
     ivoa:ucd: stat.error
-  - name: i_fpFluxSigma
-    "@id": "#DiaObject.i_fpFluxSigma"
+  - name: i_fpFluxErr
+    "@id": "#DiaObject.i_fpFluxErr"
     datatype: float
     description: Standard deviation of the distribution of i_fpFlux.
     mysql:datatype: FLOAT
@@ -386,8 +381,8 @@ tables:
     mysql:datatype: FLOAT
     fits:tunit: nJy
     ivoa:ucd: stat.error
-  - name: z_psfFluxSigma
-    "@id": "#DiaObject.z_psfFluxSigma"
+  - name: z_psfFluxErr
+    "@id": "#DiaObject.z_psfFluxErr"
     datatype: float
     description: Standard deviation of the distribution of z_psfFlux.
     mysql:datatype: FLOAT
@@ -402,7 +397,6 @@ tables:
   - name: z_psfFluxNdata
     "@id": "#DiaObject.z_psfFluxNdata"
     datatype: int
-    nullable: false
     description: The number of data points used to compute z_psfFluxChi2.
     mysql:datatype: INTEGER
   - name: z_fpFluxMean
@@ -419,8 +413,8 @@ tables:
     mysql:datatype: FLOAT
     fits:tunit: nJy
     ivoa:ucd: stat.error
-  - name: z_fpFluxSigma
-    "@id": "#DiaObject.z_fpFluxSigma"
+  - name: z_fpFluxErr
+    "@id": "#DiaObject.z_fpFluxErr"
     datatype: float
     description: Standard deviation of the distribution of z_fpFlux.
     mysql:datatype: FLOAT
@@ -440,8 +434,8 @@ tables:
     mysql:datatype: FLOAT
     fits:tunit: nJy
     ivoa:ucd: stat.error
-  - name: y_psfFluxSigma
-    "@id": "#DiaObject.y_psfFluxSigma"
+  - name: y_psfFluxErr
+    "@id": "#DiaObject.y_psfFluxErr"
     datatype: float
     description: Standard deviation of the distribution of y_psfFlux.
     mysql:datatype: FLOAT
@@ -456,7 +450,6 @@ tables:
   - name: y_psfFluxNdata
     "@id": "#DiaObject.y_psfFluxNdata"
     datatype: int
-    nullable: false
     description: The number of data points used to compute y_psfFluxChi2.
     mysql:datatype: INTEGER
   - name: y_fpFluxMean
@@ -473,8 +466,8 @@ tables:
     mysql:datatype: FLOAT
     fits:tunit: nJy
     ivoa:ucd: stat.error
-  - name: y_fpFluxSigma
-    "@id": "#DiaObject.y_fpFluxSigma"
+  - name: y_fpFluxErr
+    "@id": "#DiaObject.y_fpFluxErr"
     datatype: float
     description: Standard deviation of the distribution of y_fpFlux.
     mysql:datatype: FLOAT
@@ -567,7 +560,6 @@ tables:
   - name: nearbyObj1
     "@id": "#DiaObject.nearbyObj1"
     datatype: long
-    nullable: false
     description: Id of the closest nearby object.
     mysql:datatype: BIGINT
     ivoa:ucd: meta.id;src
@@ -586,7 +578,6 @@ tables:
   - name: nearbyObj2
     "@id": "#DiaObject.nearbyObj2"
     datatype: long
-    nullable: false
     description: Id of the second-closest nearby object.
     mysql:datatype: BIGINT
     ivoa:ucd: meta.id;src
@@ -605,7 +596,6 @@ tables:
   - name: nearbyObj3
     "@id": "#DiaObject.nearbyObj3"
     datatype: long
-    nullable: false
     description: Id of the third-closest nearby object.
     mysql:datatype: BIGINT
     ivoa:ucd: meta.id;src