docs: Use decimal type for human-entered numeric fields

- Change float32 to decimal for weight, duration, frame_rate
- Decimal is more appropriate for manually entered values
- Float remains for computed values and measurements

Affected tutorials:
- 01-first-pipeline: duration in Recording
- 03-data-entry: duration in Session
- 04-queries: weight in Subject, duration in Session
- 06-object-storage: frame_rate in ImagingSession

Also fixes:
- PostgreSQL boolean aggregation (sum(correct) -> CASE WHEN)
- PostgreSQL string quoting (double -> single quotes)

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": "2026-01-23T05:08:53.523460Z",
-     "iopub.status.busy": "2026-01-23T05:08:53.523358Z",
-     "iopub.status.idle": "2026-01-23T05:08:54.450994Z",
-     "shell.execute_reply": "2026-01-23T05:08:54.450645Z"
+     "iopub.execute_input": "2026-01-23T15:25:09.917280Z",
+     "iopub.status.busy": "2026-01-23T15:25:09.917158Z",
+     "iopub.status.idle": "2026-01-23T15:25:10.852465Z",
+     "shell.execute_reply": "2026-01-23T15:25:10.852185Z"
     }
    },
    "outputs": [
     {
      "name": "stderr",
      "output_type": "stream",
      "text": [
-      "[2026-01-22 23:08:54,443][INFO]: DataJoint 2.1.0a5 connected to postgres@localhost:5432\n"
+      "[2026-01-23 09:25:10,844][INFO]: DataJoint 2.1.0a5 connected to postgres@localhost:5432\n"
      ]
     }
    ],
@@ -56,10 +56,10 @@
    "id": "cell-3",
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2026-01-23T05:08:54.452930Z",
-     "iopub.status.busy": "2026-01-23T05:08:54.452699Z",
-     "iopub.status.idle": "2026-01-23T05:08:54.455491Z",
-     "shell.execute_reply": "2026-01-23T05:08:54.455248Z"
+     "iopub.execute_input": "2026-01-23T15:25:10.854285Z",
+     "iopub.status.busy": "2026-01-23T15:25:10.854079Z",
+     "iopub.status.idle": "2026-01-23T15:25:10.857123Z",
+     "shell.execute_reply": "2026-01-23T15:25:10.856845Z"
     }
    },
    "outputs": [],
@@ -94,10 +94,10 @@
    "id": "cell-4",
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2026-01-23T05:08:54.456757Z",
-     "iopub.status.busy": "2026-01-23T05:08:54.456647Z",
-     "iopub.status.idle": "2026-01-23T05:08:54.476357Z",
-     "shell.execute_reply": "2026-01-23T05:08:54.476057Z"
+     "iopub.execute_input": "2026-01-23T15:25:10.858558Z",
+     "iopub.status.busy": "2026-01-23T15:25:10.858446Z",
+     "iopub.status.idle": "2026-01-23T15:25:10.876981Z",
+     "shell.execute_reply": "2026-01-23T15:25:10.876637Z"
     }
    },
    "outputs": [],
@@ -117,10 +117,10 @@
    "id": "cell-5",
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2026-01-23T05:08:54.478343Z",
-     "iopub.status.busy": "2026-01-23T05:08:54.478193Z",
-     "iopub.status.idle": "2026-01-23T05:08:54.490438Z",
-     "shell.execute_reply": "2026-01-23T05:08:54.490133Z"
+     "iopub.execute_input": "2026-01-23T15:25:10.878663Z",
+     "iopub.status.busy": "2026-01-23T15:25:10.878517Z",
+     "iopub.status.idle": "2026-01-23T15:25:10.889496Z",
+     "shell.execute_reply": "2026-01-23T15:25:10.889022Z"
     }
    },
    "outputs": [
@@ -184,10 +184,10 @@
    "id": "cell-8",
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2026-01-23T05:08:54.492077Z",
-     "iopub.status.busy": "2026-01-23T05:08:54.491947Z",
-     "iopub.status.idle": "2026-01-23T05:08:54.494724Z",
-     "shell.execute_reply": "2026-01-23T05:08:54.494508Z"
+     "iopub.execute_input": "2026-01-23T15:25:10.891212Z",
+     "iopub.status.busy": "2026-01-23T15:25:10.891079Z",
+     "iopub.status.idle": "2026-01-23T15:25:10.893797Z",
+     "shell.execute_reply": "2026-01-23T15:25:10.893584Z"
     }
    },
    "outputs": [],
@@ -219,10 +219,10 @@
    "id": "cell-9",
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2026-01-23T05:08:54.496162Z",
-     "iopub.status.busy": "2026-01-23T05:08:54.496035Z",
-     "iopub.status.idle": "2026-01-23T05:08:54.512198Z",
-     "shell.execute_reply": "2026-01-23T05:08:54.511935Z"
+     "iopub.execute_input": "2026-01-23T15:25:10.895290Z",
+     "iopub.status.busy": "2026-01-23T15:25:10.895070Z",
+     "iopub.status.idle": "2026-01-23T15:25:10.910255Z",
+     "shell.execute_reply": "2026-01-23T15:25:10.909992Z"
     }
    },
    "outputs": [
@@ -256,10 +256,10 @@
    "id": "cell-10",
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2026-01-23T05:08:54.513489Z",
-     "iopub.status.busy": "2026-01-23T05:08:54.513360Z",
-     "iopub.status.idle": "2026-01-23T05:08:54.516812Z",
-     "shell.execute_reply": "2026-01-23T05:08:54.516563Z"
+     "iopub.execute_input": "2026-01-23T15:25:10.911546Z",
+     "iopub.status.busy": "2026-01-23T15:25:10.911463Z",
+     "iopub.status.idle": "2026-01-23T15:25:10.914976Z",
+     "shell.execute_reply": "2026-01-23T15:25:10.914676Z"
     }
    },
    "outputs": [],