diff --git a/.github/workflows/abi.yaml b/.github/workflows/abi.yaml
index fcc56daf8..e47578923 100644
--- a/.github/workflows/abi.yaml
+++ b/.github/workflows/abi.yaml
@@ -134,8 +134,8 @@ jobs:
       id: collectlogs
       run: |
         sudo chmod a+rw .
-        sudo find . -name regression.diffs -exec cat {} + > regression.log
-        sudo find . -name postmaster.log -exec cat {} + > postgres.log
+        sudo find build_abi -name regression.diffs -exec cat {} + > regression.log
+        sudo find build_abi -name postmaster.log -exec cat {} + > postmaster.log
         if [[ -s regression.log ]]; then echo "regression_diff=true" >>$GITHUB_OUTPUT; fi
         grep -e 'FAILED' -e 'failed (ignored)' -e 'not ok' installcheck.log || true
         cat regression.log
@@ -152,5 +152,5 @@ jobs:
       uses: actions/upload-artifact@v4
       with:
         name: PostgreSQL log ABI Breakage ${{ matrix.dir }} PG${{ matrix.pg }}
-        path: postgres.log
+        path: postmaster.log
 
diff --git a/.github/workflows/libfuzzer.yaml b/.github/workflows/libfuzzer.yaml
index d7d8bffbb..d4a164ef3 100644
--- a/.github/workflows/libfuzzer.yaml
+++ b/.github/workflows/libfuzzer.yaml
@@ -28,7 +28,7 @@ jobs:
         # If needed, install them before opening the core dump.
         sudo apt-get update
         sudo apt-get install 7zip clang lld llvm flex bison libipc-run-perl \
-          libtest-most-perl tree
+          libtest-most-perl tree jq
 
     - name: Checkout TimescaleDB
       uses: actions/checkout@v4
@@ -134,6 +134,7 @@ jobs:
     env:
       PG_SRC_DIR: pgbuild
       PG_INSTALL_DIR: postgresql
+      JOB_NAME: Fuzz decompression ${{ matrix.case.algo }} ${{ matrix.case.pgtype }} ${{ matrix.case.bulk && 'bulk' || 'rowbyrow' }}
 
     steps:
     - name: Install Linux dependencies
@@ -204,7 +205,9 @@ jobs:
         export PGPORT=5432
         export PGDATABASE=postgres
         export PATH=$HOME/$PG_INSTALL_DIR/bin:$PATH
-        pg_ctl -l postgres.log start
+        pg_ctl -o "-clogging_collector=true" -o "-clog_destination=jsonlog,stderr" \
+            -o "-clog_directory=$(readlink -f .)" -o "-clog_filename=postmaster.log" \
+            -o "-clog_error_verbosity=verbose" start
 
         psql -c "create extension timescaledb;"
 
@@ -265,7 +268,7 @@ jobs:
         [ $errors -eq 0 ] || exit 1
 
         # Shouldn't have any WARNINGS in the log.
-        ! grep -F "] WARNING: " postgres.log
+        ! grep -F "] WARNING: " postmaster.log
 
         # Check that the server is still alive.
         psql -c "select 1"
@@ -285,7 +288,7 @@ jobs:
       uses: actions/upload-artifact@v4
       with:
         name: PostgreSQL log for ${{ steps.config.outputs.name }}
-        path: postgres.log
+        path: postgres.*
 
     - name: Save fuzzer-generated crash cases
       if: always()
@@ -350,7 +353,6 @@ jobs:
           bt full
         " 2>&1 | tee stacktrace.log
         ./scripts/bundle_coredumps.sh
-        grep -C40 "was terminated by signal" postgres.log > postgres-failure.log ||:
         exit 1 # Fail the job if we have core dumps.
 
     - name: Upload core dumps
@@ -359,3 +361,24 @@ jobs:
       with:
         name: Coredumps for ${{ steps.config.outputs.name }}
         path: coredumps
+
+    - name: Upload test results to the database
+      if: always()
+      env:
+        CI_STATS_DB: ${{ secrets.CI_STATS_DB }}
+        GITHUB_EVENT_NAME: ${{ github.event_name }}
+        GITHUB_REF_NAME: ${{ github.ref_name }}
+        GITHUB_REPOSITORY: ${{ github.repository }}
+        GITHUB_RUN_ATTEMPT: ${{ github.run_attempt }}
+        GITHUB_RUN_ID: ${{ github.run_id }}
+        GITHUB_RUN_NUMBER: ${{ github.run_number }}
+        JOB_STATUS: ${{ job.status }}
+      run: |
+        if [[ "${{ github.event_name }}" == "pull_request" ]] ;
+        then
+            GITHUB_PR_NUMBER="${{ github.event.number }}"
+        else
+            GITHUB_PR_NUMBER=0
+        fi
+        export GITHUB_PR_NUMBER
+        scripts/upload_ci_stats.sh
diff --git a/.github/workflows/linux-32bit-build-and-test.yaml b/.github/workflows/linux-32bit-build-and-test.yaml
index 7a5d9cab0..ed3cdacc0 100644
--- a/.github/workflows/linux-32bit-build-and-test.yaml
+++ b/.github/workflows/linux-32bit-build-and-test.yaml
@@ -142,8 +142,8 @@ jobs:
       id: collectlogs
       shell: bash
       run: |
-        find . -name regression.diffs -exec cat {} + > regression.log
-        find . -name postmaster.log -exec cat {} + > postgres.log
+        find build -name regression.diffs -exec cat {} + > regression.log
+        find build -name postmaster.log -exec cat {} + > postmaster.log
         if [[ -s regression.log ]]; then echo "regression_diff=true" >>$GITHUB_OUTPUT; fi
         grep -e 'FAILED' -e 'failed (ignored)' -e 'not ok' installcheck.log || true
         cat regression.log
@@ -205,7 +205,7 @@ jobs:
       uses: actions/upload-artifact@v4
       with:
         name: PostgreSQL log linux-i386 PG${{ matrix.pg }}
-        path: postgres.log
+        path: postmaster.log
 
     - name: Save TAP test logs
       if: always()
diff --git a/.github/workflows/linux-build-and-test.yaml b/.github/workflows/linux-build-and-test.yaml
index 8b2eac6ac..6fe6726c6 100644
--- a/.github/workflows/linux-build-and-test.yaml
+++ b/.github/workflows/linux-build-and-test.yaml
@@ -144,7 +144,8 @@ jobs:
       run: |
         BUILD_DIR=nossl ./bootstrap -DCMAKE_BUILD_TYPE=Debug \
           -DPG_SOURCE_DIR=~/$PG_SRC_DIR -DPG_PATH=~/$PG_INSTALL_DIR \
-          ${{ matrix.tsdb_build_args }} -DCODECOVERAGE=${{ matrix.coverage }} -DUSE_OPENSSL=OFF
+          ${{ matrix.tsdb_build_args }} -DCODECOVERAGE=${{ matrix.coverage }} -DUSE_OPENSSL=OFF \
+          -DTEST_PG_LOG_DIRECTORY="$(readlink -f .)"
         make -j $MAKE_JOBS -C nossl
         make -C nossl install
         make -C nossl regresscheck TESTS=telemetry
@@ -153,7 +154,8 @@ jobs:
       run: |
         ./bootstrap -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} \
           -DPG_SOURCE_DIR=~/$PG_SRC_DIR -DPG_PATH=~/$PG_INSTALL_DIR \
-          ${{ matrix.tsdb_build_args }} -DCODECOVERAGE=${{ matrix.coverage }}
+          ${{ matrix.tsdb_build_args }} -DCODECOVERAGE=${{ matrix.coverage }} \
+          -DTEST_PG_LOG_DIRECTORY="$(readlink -f .)"
         make -j $MAKE_JOBS -C build
         make -C build install
 
@@ -195,7 +197,7 @@ jobs:
       id: collectlogs
       run: |
         find . -name regression.diffs -exec cat {} + > regression.log
-        find . -name postmaster.log -exec cat {} + > postgres.log
+
         if [[ "${{ runner.os }}" == "Linux" ]] ; then
           # wait in case there are in-progress coredumps
           sleep 10
@@ -223,7 +225,7 @@ jobs:
       uses: actions/upload-artifact@v4
       with:
         name: PostgreSQL log ${{ matrix.os }} ${{ matrix.name }} ${{ matrix.pg }}
-        path: postgres.log
+        path: postmaster.*
 
     - name: Stack trace Linux
       if: always() && steps.collectlogs.outputs.coredumps == 'true' && runner.os == 'Linux'
@@ -248,7 +250,6 @@ jobs:
           info locals
         " 2>&1 | tee stacktrace.log
         ./scripts/bundle_coredumps.sh
-        grep -C40 "was terminated by signal" postgres.log > postgres-failure.log ||:
 
     - name: Stack trace macOS
       if: always() && steps.collectlogs.outputs.coredumps == 'true' && runner.os == 'macOS'
@@ -275,7 +276,7 @@ jobs:
       # Don't upload the results of the flaky check, because the db schema only
       # supports running one test once per job. Also disable uploading of the
       # tests on macOS till the next MINOR release of PG
-      if: always() && (! contains(matrix.name, 'Flaky')) && (! runner.os == 'macOS')
+      if: always() && (! contains(matrix.name, 'Flaky')) && ( runner.os != 'macOS' )
       env:
         # GitHub Actions allow you neither to use the env context for the job name,
         # nor to access the job name from the step context, so we have to
diff --git a/.github/workflows/sanitizer-build-and-test.yaml b/.github/workflows/sanitizer-build-and-test.yaml
index 261455cd4..bc9f20f98 100644
--- a/.github/workflows/sanitizer-build-and-test.yaml
+++ b/.github/workflows/sanitizer-build-and-test.yaml
@@ -140,7 +140,8 @@ jobs:
     - name: Build TimescaleDB
       run: |
         ./bootstrap -DCMAKE_BUILD_TYPE=Debug -DPG_SOURCE_DIR=~/$PG_SRC_DIR \
-          -DPG_PATH=~/$PG_INSTALL_DIR -DCODECOVERAGE=OFF -DREQUIRE_ALL_TESTS=ON -DTEST_GROUP_SIZE=5
+          -DPG_PATH=~/$PG_INSTALL_DIR -DCODECOVERAGE=OFF -DREQUIRE_ALL_TESTS=ON \
+          -DTEST_GROUP_SIZE=5 -DTEST_PG_LOG_DIRECTORY="$(readlink -f .)"
         make -j$(nproc) -C build
         make -C build install
 
@@ -157,7 +158,6 @@ jobs:
       id: collectlogs
       run: |
         find . -name regression.diffs -exec cat {} + > regression.log
-        find . -name postmaster.log -exec cat {} + > postgres.log
         if [[ "${{ runner.os }}" == "Linux" ]] ; then
           # wait in case there are in-progress coredumps
           sleep 10
@@ -183,7 +183,7 @@ jobs:
       uses: actions/upload-artifact@v4
       with:
         name: PostgreSQL log ${{ matrix.os }} ${{ env.name }} ${{ matrix.pg }}
-        path: postgres.log
+        path: postmaster.*
 
     - name: Stack trace
       if: always() && steps.collectlogs.outputs.coredumps == 'true'
@@ -202,7 +202,6 @@ jobs:
           bt full
         " 2>&1 | tee stacktrace.log
         ./scripts/bundle_coredumps.sh
-        grep -C40 "was terminated by signal" postgres.log > postgres-failure.log ||:
 
     - name: Show sanitizer logs
       if: always()
diff --git a/.github/workflows/sqlsmith.yaml b/.github/workflows/sqlsmith.yaml
index a211e7f03..8b4d6cb43 100644
--- a/.github/workflows/sqlsmith.yaml
+++ b/.github/workflows/sqlsmith.yaml
@@ -34,7 +34,7 @@ jobs:
         sudo apt-get update
         sudo apt-get install gnupg systemd-coredump gdb postgresql-common \
             libkrb5-dev build-essential autoconf autoconf-archive \
-            libboost-regex-dev libsqlite3-dev
+            libboost-regex-dev libsqlite3-dev jq
 
         yes | sudo /usr/share/postgresql-common/pgdg/apt.postgresql.org.sh
         sudo apt-get purge postgresql*
@@ -75,7 +75,9 @@ jobs:
         /usr/lib/postgresql/${{ matrix.pg }}/bin/pg_ctl -D ~/pgdata start \
             -o "-cshared_preload_libraries=timescaledb" -o "-cmax_connections=200" \
             -o "-cmax_prepared_transactions=100" -o "-cunix_socket_directories=/tmp" \
-            -o "-clog_statement=all" -l postgres.log
+            -o "-clog_statement=all" -o "-clogging_collector=true" \
+            -o "-clog_destination=jsonlog,stderr" -o "-clog_directory=$(readlink -f .)" \
+            -o "-clog_error_verbosity=verbose" -o "-clog_filename=postmaster.log"
         psql -h /tmp postgres -c 'CREATE DATABASE smith;'
         psql -h /tmp smith -c 'CREATE EXTENSION timescaledb;'
         psql -h /tmp smith -c '\i ${{ github.workspace }}/tsl/test/shared/sql/include/shared_setup.sql'
@@ -100,8 +102,6 @@ jobs:
             2>&1 | tee -a sqlsmith.log
 
             psql "host=/tmp dbname=smith" -c "select 1"
-
-            truncate --size=0 postgres.log
         done
 
     - name: Check for coredumps
@@ -146,7 +146,7 @@ jobs:
       uses: actions/upload-artifact@v4
       with:
         name: PostgreSQL log for PG${{ matrix.pg }}
-        path: postgres.log
+        path: postgres.*
 
     - name: Upload test results to the database
       if: always()
diff --git a/.github/workflows/windows-build-and-test.yaml b/.github/workflows/windows-build-and-test.yaml
index 5a0d4cbdd..db28fabda 100644
--- a/.github/workflows/windows-build-and-test.yaml
+++ b/.github/workflows/windows-build-and-test.yaml
@@ -149,7 +149,7 @@ jobs:
         copy build_win/test/postgresql.conf ${{ env.PGDATA }}
         copy build_win/test/pg_hba.conf ${{ env.PGDATA }}
         icacls . /grant runneradmin:F /T
-        ~/PostgreSQL/${{ matrix.pg }}/bin/pg_ctl start -o "${{ matrix.pg_config }}" --log=postgres.log
+        ~/PostgreSQL/${{ matrix.pg }}/bin/pg_ctl start -o "${{ matrix.pg_config }}" --log=postmaster.log
         ~/PostgreSQL/${{ matrix.pg }}/bin/pg_isready -U postgres -d postgres --timeout=30
         ~/PostgreSQL/${{ matrix.pg }}/bin/psql -U postgres -d postgres -c 'CREATE USER root SUPERUSER LOGIN;'
         echo "PG version:"
@@ -191,7 +191,7 @@ jobs:
         ~/PostgreSQL/${{ matrix.pg }}/bin/initdb -U postgres -A trust --locale=en_US --encoding=UTF8
         copy build_win/tsl/test/postgresql.conf ${{ env.PGDATA }}
         copy build_win/tsl/test/pg_hba.conf ${{ env.PGDATA }}
-        ~/PostgreSQL/${{ matrix.pg }}/bin/pg_ctl start -o "${{ matrix.pg_config }}" --log="postgres.log"
+        ~/PostgreSQL/${{ matrix.pg }}/bin/pg_ctl start -o "${{ matrix.pg_config }}" --log="postmaster.log"
         ~/PostgreSQL/${{ matrix.pg }}/bin/pg_isready -U postgres -d postgres --timeout=30
         ~/PostgreSQL/${{ matrix.pg }}/bin/psql -U postgres -d postgres -c 'CREATE USER root SUPERUSER LOGIN;'
 
@@ -237,7 +237,7 @@ jobs:
       uses: actions/upload-artifact@v4
       with:
         name: PostgreSQL ${{ matrix.pg }} log ${{ matrix.os }} ${{ matrix.build_type }} Build
-        path: postgres.log
+        path: postmaster.log
 
     - name: Upload test results to the database
       if: always()
diff --git a/scripts/upload_ci_stats.sh b/scripts/upload_ci_stats.sh
index e6b6ba7e8..8bbfc924a 100755
--- a/scripts/upload_ci_stats.sh
+++ b/scripts/upload_ci_stats.sh
@@ -56,6 +56,15 @@ create table log(
 create unique index on log(job_date, test_name);
 
 select create_hypertable('log', 'job_date');
+
+create table ipe(
+    job_date timestamptz,
+    error text,
+    location text,
+    statement text
+);
+
+select create_hypertable('ipe', 'job_date');
 "
 
 # Create the job record.
@@ -149,6 +158,15 @@ do
     mv "$x.tmp" "$x"
 done
 
+# Save a snippet of logs where a backend was terminated by signal.
+grep -C40 "was terminated by signal" postmaster.log > postgres-failure.log ||:
+
+# Find internal program errors in Postgres logs.
+jq 'select(.state_code == "XX000" and .error_severity != "LOG")
+    | [env.JOB_DATE, .message, .func_name,  .statement] | @tsv
+' -r postmaster.json > ipe.tsv ||:
+"${PSQL[@]}" -c "\copy ipe from ipe.tsv"
+
 # Upload the logs.
 # Note that the sanitizer setting log_path means "write logs to 'log_path.pid'".
 for x in sanitizer* sanitizer/* {sqlsmith/sqlsmith,sanitizer,stacktrace,postgres-failure}.log *.diff
diff --git a/test/postgresql.conf.in b/test/postgresql.conf.in
index 85348d0e1..cb03e9c0f 100644
--- a/test/postgresql.conf.in
+++ b/test/postgresql.conf.in
@@ -1,20 +1,27 @@
 # NOTE: any changes here require changes to tsl/test/postgresql.conf. Its prefix
 # must be the same as this file.
 
-shared_preload_libraries=timescaledb
-max_worker_processes=24
 autovacuum=false
-random_page_cost=1.0
-timezone='US/Pacific'
 datestyle='Postgres, MDY'
-timescaledb.license='apache'
-@TELEMETRY_DEFAULT_SETTING@
+hba_file='@TEST_PG_HBA_FILE@'
+log_destination='@TEST_PG_LOG_DESTINATION@'
+log_directory='@TEST_PG_LOG_DIRECTORY@'
+log_filename='postmaster.log'
+log_line_prefix='%m: %u [%p] %d '
+logging_collector=true
+max_worker_processes=24
+random_page_cost=1.0
+shared_preload_libraries=timescaledb
 timescaledb.last_tuned='1971-02-03 04:05:06.789012 -0300'
 timescaledb.last_tuned_version='0.0.1'
+timescaledb.passfile='@TEST_PASSFILE@'
 timescaledb_telemetry.cloud='ci'
-log_line_prefix='%m: %u [%p] %d '
+timezone='US/Pacific'
+
 # Set extra_float_digits=0 to retain the pre PG12 rounding behaviour
 # of floating point numbers, which are needed to make our tests work.
 extra_float_digits=0
-timescaledb.passfile='@TEST_PASSFILE@'
-hba_file='@TEST_PG_HBA_FILE@'
+
+@TELEMETRY_DEFAULT_SETTING@
+
+timescaledb.license='apache'
diff --git a/test/test-defs.cmake b/test/test-defs.cmake
index cff52d559..6b9ba043e 100644
--- a/test/test-defs.cmake
+++ b/test/test-defs.cmake
@@ -52,6 +52,19 @@ endif()
 configure_file(${PRIMARY_TEST_DIR}/pg_hba.conf.in pg_hba.conf)
 set(TEST_PG_HBA_FILE ${TEST_OUTPUT_DIR}/pg_hba.conf)
 
+# Enable json logs that are supported since PG15, to get additional information
+# about errors from them for CI database.
+if(PG_VERSION_MAJOR LESS 15)
+  set(TEST_PG_LOG_DESTINATION stderr)
+else()
+  set(TEST_PG_LOG_DESTINATION jsonlog,stderr)
+endif()
+
+# This variable is set differently in CI. We use it to save the logs outside the
+# tmp instance, because it is deleted by pg_regress on successful test
+# completion, and we want to run some additional checks on the logs in any case.
+option(TEST_PG_LOG_DIRECTORY "Log directory for regression tests" "log")
+
 if(USE_TELEMETRY)
   set(TELEMETRY_DEFAULT_SETTING "timescaledb.telemetry_level=off")
 else()
diff --git a/tsl/test/postgresql.conf.in b/tsl/test/postgresql.conf.in
index fcf879a41..8b043fb44 100644
--- a/tsl/test/postgresql.conf.in
+++ b/tsl/test/postgresql.conf.in
@@ -1,20 +1,27 @@
 # This section has to be equivalent to test/postgresql.conf
-shared_preload_libraries=timescaledb
-max_worker_processes=24
+
 autovacuum=false
-random_page_cost=1.0
-timezone='US/Pacific'
 datestyle='Postgres, MDY'
-@TELEMETRY_DEFAULT_SETTING@
+hba_file='@TEST_PG_HBA_FILE@'
+log_destination='@TEST_PG_LOG_DESTINATION@'
+log_directory='@TEST_PG_LOG_DIRECTORY@'
+log_filename='postmaster.log'
+log_line_prefix='%m: %u [%p] %d '
+logging_collector=true
+max_worker_processes=24
+random_page_cost=1.0
+shared_preload_libraries=timescaledb
 timescaledb.last_tuned='1971-02-03 04:05:06.789012 -0300'
 timescaledb.last_tuned_version='0.0.1'
+timescaledb.passfile='@TEST_PASSFILE@'
 timescaledb_telemetry.cloud='ci'
-log_line_prefix='%m %u [%p] %d '
+timezone='US/Pacific'
+
 # Set extra_float_digits=0 to retain the pre PG12 rounding behaviour
 # of floating point numbers, which are needed to make our tests work.
 extra_float_digits=0
-timescaledb.passfile='@TEST_PASSFILE@'
-hba_file='@TEST_PG_HBA_FILE@'
+
+@TELEMETRY_DEFAULT_SETTING@
 
 # This section adds additional options required by TSL.
 timescaledb.license='timescale'