docs: re-execute all notebooks with PostgreSQL compatibility fixes

All 21 notebooks now pass on PostgreSQL with:
- Working schema diagrams
- TIMESTAMPDIFF/CURDATE date function translations
- No SSL warnings

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: dimitri-yatsenko

src/how-to/model-relationships.ipynb

@@ -20,18 +20,18 @@
    "id": "cell-1",
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2026-01-20T21:20:26.813254Z",
-     "iopub.status.busy": "2026-01-20T21:20:26.812895Z",
-     "iopub.status.idle": "2026-01-20T21:20:27.663042Z",
-     "shell.execute_reply": "2026-01-20T21:20:27.662693Z"
+     "iopub.execute_input": "2026-01-20T21:55:10.852503Z",
+     "iopub.status.busy": "2026-01-20T21:55:10.852227Z",
+     "iopub.status.idle": "2026-01-20T21:55:11.613843Z",
+     "shell.execute_reply": "2026-01-20T21:55:11.613456Z"
     }
    },
    "outputs": [
     {
      "name": "stderr",
      "output_type": "stream",
      "text": [
-      "[2026-01-20 15:20:27,654][INFO]: DataJoint 2.1.0a2 connected to postgres@127.0.0.1:5432\n"
+      "[2026-01-20 15:55:11,607][INFO]: DataJoint 2.1.0a2 connected to postgres@127.0.0.1:5432\n"
      ]
     }
    ],
@@ -56,10 +56,10 @@
    "id": "cell-3",
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2026-01-20T21:20:27.665254Z",
-     "iopub.status.busy": "2026-01-20T21:20:27.664972Z",
-     "iopub.status.idle": "2026-01-20T21:20:27.668089Z",
-     "shell.execute_reply": "2026-01-20T21:20:27.667835Z"
+     "iopub.execute_input": "2026-01-20T21:55:11.615742Z",
+     "iopub.status.busy": "2026-01-20T21:55:11.615522Z",
+     "iopub.status.idle": "2026-01-20T21:55:11.618201Z",
+     "shell.execute_reply": "2026-01-20T21:55:11.617950Z"
     }
    },
    "outputs": [],
@@ -94,10 +94,10 @@
    "id": "cell-4",
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2026-01-20T21:20:27.669818Z",
-     "iopub.status.busy": "2026-01-20T21:20:27.669693Z",
-     "iopub.status.idle": "2026-01-20T21:20:27.687948Z",
-     "shell.execute_reply": "2026-01-20T21:20:27.687637Z"
+     "iopub.execute_input": "2026-01-20T21:55:11.619684Z",
+     "iopub.status.busy": "2026-01-20T21:55:11.619557Z",
+     "iopub.status.idle": "2026-01-20T21:55:11.638495Z",
+     "shell.execute_reply": "2026-01-20T21:55:11.638197Z"
     }
    },
    "outputs": [],
@@ -117,10 +117,10 @@
    "id": "cell-5",
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2026-01-20T21:20:27.689459Z",
-     "iopub.status.busy": "2026-01-20T21:20:27.689340Z",
-     "iopub.status.idle": "2026-01-20T21:20:27.700979Z",
-     "shell.execute_reply": "2026-01-20T21:20:27.700737Z"
+     "iopub.execute_input": "2026-01-20T21:55:11.639928Z",
+     "iopub.status.busy": "2026-01-20T21:55:11.639822Z",
+     "iopub.status.idle": "2026-01-20T21:55:11.650575Z",
+     "shell.execute_reply": "2026-01-20T21:55:11.650268Z"
     }
    },
    "outputs": [
@@ -184,10 +184,10 @@
    "id": "cell-8",
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2026-01-20T21:20:27.702374Z",
-     "iopub.status.busy": "2026-01-20T21:20:27.702279Z",
-     "iopub.status.idle": "2026-01-20T21:20:27.704912Z",
-     "shell.execute_reply": "2026-01-20T21:20:27.704705Z"
+     "iopub.execute_input": "2026-01-20T21:55:11.652124Z",
+     "iopub.status.busy": "2026-01-20T21:55:11.652029Z",
+     "iopub.status.idle": "2026-01-20T21:55:11.654817Z",
+     "shell.execute_reply": "2026-01-20T21:55:11.654571Z"
     }
    },
    "outputs": [],
@@ -219,10 +219,10 @@
    "id": "cell-9",
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2026-01-20T21:20:27.706159Z",
-     "iopub.status.busy": "2026-01-20T21:20:27.706047Z",
-     "iopub.status.idle": "2026-01-20T21:20:27.724376Z",
-     "shell.execute_reply": "2026-01-20T21:20:27.724109Z"
+     "iopub.execute_input": "2026-01-20T21:55:11.656198Z",
+     "iopub.status.busy": "2026-01-20T21:55:11.655903Z",
+     "iopub.status.idle": "2026-01-20T21:55:11.671079Z",
+     "shell.execute_reply": "2026-01-20T21:55:11.670826Z"
     }
    },
    "outputs": [
@@ -256,10 +256,10 @@
    "id": "cell-10",
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2026-01-20T21:20:27.725714Z",
-     "iopub.status.busy": "2026-01-20T21:20:27.725617Z",
-     "iopub.status.idle": "2026-01-20T21:20:27.729127Z",
-     "shell.execute_reply": "2026-01-20T21:20:27.728857Z"
+     "iopub.execute_input": "2026-01-20T21:55:11.672385Z",
+     "iopub.status.busy": "2026-01-20T21:55:11.672287Z",
+     "iopub.status.idle": "2026-01-20T21:55:11.675328Z",
+     "shell.execute_reply": "2026-01-20T21:55:11.675084Z"
     }
    },
    "outputs": [],